# PH13-8Mo Forgings — UNS S13800 / AMS 5629 / ASTM A705 Type XM-13 / EN 1.4534

**Supplier:** Jiangyin Jiangnan Metal Co., Ltd., integrated steel melting and open-die forging works
**Address:** No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China
**Telephone:** 0086-189-2135-9659 · **Email:** sales@steelforgepieces.com
**Canonical page:** https://www.steelforgepieces.com/Stainless-Steel/PH13-8Mo.html
**Revised:** 3 October 2026

---

## 01 What PH13-8Mo is

PH13-8Mo is the common shop name for the alloy specified generically as UNS S13800, ASTM A564
Type XM-13 for bars and shapes, ASTM A705 Type XM-13 for forgings, AMS 5629 for bars, wire,
forgings, rings and extrusions, AMS 5864 for flat products, and EN 1.4534 in Europe. Composition
runs 12.25–13.25 % chromium, 7.50–8.50 % nickel, 2.00–2.50 % molybdenum and 0.90–1.35 % aluminium,
with carbon at 0.05 % maximum and manganese and silicon at 0.10 % each.

It is solution treated at 927 °C and cooled below 16 °C so the structure transforms fully to
martensite, then aged four hours between 510 and 621 °C. Specified minimum tensile strength runs
from 1,517 MPa in H950 to 931 MPa in H1150. Density is 7.76 g/cm³ and the alloy is ferromagnetic
in every condition.

The reason it is specified over cheaper precipitation-hardening grades is not strength alone.
Tight carbon, manganese, silicon and sulfur limits plus vacuum melting keep transverse and
short-transverse ductility close to the longitudinal values in thick sections. AMS 5864 specifies
short-transverse reduction of area as a separate requirement, 35 % in H950 rising to 50 % in H1150.

### Who supplies the forgings on this page

Jiangyin Jiangnan Metal Co., Ltd. has been melting and forging steel at No.1 Chengxiqiao Road,
Zhouzhuang Town, Jiangyin City, Jiangsu Province, China since 1997. Standard grades run through
the electric arc furnace, ladle furnace and vacuum oxygen decarburisation. Clean grades such as
UNS S13800 take the vacuum induction and vacuum arc remelting route, with 3 t and 6 t
protective-atmosphere electroslag furnaces also on site. Steel then goes to the 6,300 t, 4,000 t
and 2,000 t presses, the 6 m, 3 m and 1 m ring mills, 14 heat-treatment furnaces and the machine
shop without leaving the plant, so one heat number follows the part to the certificate. 460 staff
including 9 senior and 32 intermediate engineers. Approvals from CCS, BV, DNV, LR and NK.

### Quick reference

| Item | Value |
|---|---|
| UNS number | S13800 |
| Alloy type | Martensitic precipitation-hardening stainless steel, strengthened by nickel-aluminium intermetallics |
| Nominal composition | 12.7 Cr, 8 Ni, 2.2 Mo, 1 Al, 0.05 C max |
| Density | 7.72–7.76 g/cm³ (0.279–0.280 lb/in³) |
| Melting range | 1404–1471 °C (2560–2680 °F) |
| Dynamic modulus | 200 GPa at 21 °C, 194 GPa at 100 °C |
| Strength range | 931 MPa min (H1150) to 1,517 MPa min (H950); ~1,620 MPa typical (RH950) |
| Hardness range | 30 HRC min (H1150) to 45 HRC min (H950); ~48 HRC typical (RH950) |
| Solution treatment | 927 °C ±8 °C, cool below 16 °C |
| Aging | 510–621 °C, 4 h, air cool |
| Forging range | 1177–1204 °C, finish above 954 °C |
| Magnetic | Yes, all conditions |
| Corrosion resistance | Salt-fog rusting resistance in H950 similar to Type 304 |
| Lead time | 20–60 days, upper end for double-melt material |

*Sources: Rolled Alloys Data Sheet 13-8 Stainless (Bulletin 1022USe); High Temp Metals PH 13-8 Mo
technical data. Capability and lead time: Jiangyin Jiangnan Metal production records.*

### Two figures circulating for this grade are wrong

ASTM B564 is quoted on a number of supplier pages for PH13-8Mo, but B564 covers nickel-alloy
forgings and does not apply to UNS S13800. The correct forging specification is ASTM A705 Type
XM-13, or AMS 5629. The conditions H900, H925 and H1075 are also often listed for this grade; they
belong to 17-4PH. PH13-8Mo is aged at 950, 1000, 1025, 1050, 1100 or 1150 °F, plus the refrigerated
RH950 cycle and the double-aged H1150M cycle. Both points were corrected here in October 2026.

---

## 02 Forged shapes

Three routes: open-die forging for shafts, blocks, discs and tube sheets; seamless ring rolling for
rings from 50 to 6,000 mm outside diameter; upset-and-punch forging for short, large-section discs
and hubs below the ring-mill range.

Shapes supplied: seamless rolled rings, forged rings, shafts and spindles, valve stems, valve bodies
and bonnets, seat rings, discs and blanks, tube sheets, flanges, round and flat bars, blocks,
bushings and sleeves, hollow cylinders, eccentric shafts, gear blanks, nozzles, near-net shapes.

Working envelope: single pieces to 30,000 kg on the 6,300 t press; rolled rings to 6,000 mm outside
diameter and from 50 mm by upset and punch; turned shafts to 14,000 mm with 15 m well furnaces for
vertical quenching; machined discs to 5,000 mm swing; deep-hole bored cylinders to 1,600 × 10,000 mm.

For UNS S13800 the clean-melt ingot governs rather than the press. The 3 t vacuum induction and
6 t vacuum arc remelting furnaces set the realistic ceiling for double-melt material.

Related pages: PH13-8Mo forged rings (/Forged-Rings/PH13-8Mo-Forged-Rings.html), PH13-8Mo forging
rings (/Forging-Rings/PH13-8Mo-Forging-Rings.html), seamless rolled rings
(/Seamless-Rolled-Rings/), forged shafts (/Forged-Shafts/), forged valve parts
(/Forged-Valve-Parts/), forged tube sheets (/Forged-Tube-Sheets/), forged flanges
(/Forged-Flanges/), forged bars (/Forged-Bars/), forged parts (/Forged-Parts/).

---

## 03 Which specification to cite

| Origin | Designation | Scope |
|---|---|---|
| United States, brand | PH 13-8 Mo | Registered trademark of Cleveland-Cliffs Inc. We supply the generic equivalents below |
| United States, UNS | UNS S13800 | Unified Numbering System designation |
| ASTM, bars and shapes | ASTM A564 Type XM-13 | Hot-rolled and cold-finished age-hardening bars, rods, shapes |
| ASTM, forgings | **ASTM A705 Type XM-13** | The specification to cite on a forging order |
| ASTM, flat products | ASTM A693 Grade XM-13 | Plate, sheet, strip |
| SAE, bars and forgings | **AMS 5629** | Bars, wire, forgings, rings, extrusions |
| SAE, flat products | AMS 5864 | Sheet, strip, plate; source of the section 06 minima |
| Europe | EN 1.4534, X3CrNiMoAl13-8-2 | European material number and name |
| Shop-floor names | 13-8Mo, 13-8 PH, 13/8 Mo, 13/8PH | Informal names on legacy drawings |
| Does not apply | ASTM B564 | Nickel-alloy forging specification, cited for this grade in error |

*Compiled from SSA Corp AMS 5629 and UNS S13800 listings, California Metal and Supply ASTM A564 and
A705 XM-13 listings, product-form comparison of AMS 5629 against AMS 5864, and EN 10088-3.*

---

## 04 Chemical composition, weight percent

| Element | Min | Max | Function |
|---|---|---|---|
| Carbon | – | 0.05 | Held low; strengthening is by intermetallics, not carbides |
| Manganese | – | 0.10 | One tenth of the 17-4PH limit, suppresses manganese sulfides |
| Silicon | – | 0.10 | Cleanliness and transverse ductility |
| Phosphorus | – | 0.01 | Residual, embrittles grain boundaries |
| Sulfur | – | 0.008 | Tightest limit among the common PH grades |
| Nitrogen | – | 0.01 | Controlled; avoid reducing furnace atmospheres |
| Chromium | 12.25 | 13.25 | Corrosion resistance, martensite stability |
| Nickel | 7.50 | 8.50 | Toughness, partner to aluminium in the strengthening phase |
| Molybdenum | 2.00 | 2.50 | Pitting resistance, solid-solution strengthening |
| Aluminium | 0.90 | 1.35 | Precipitation-hardening element, forms nickel-aluminium precipitates |
| Iron | Balance | | Matrix |

*Rolled Alloys and High Temp Metals agree on all limits shown.*

No part of this table is reachable by air melting. Carbon at 0.05 % with manganese and silicon at
0.10 % and sulfur at 0.008 % needs vacuum induction melting followed by vacuum arc remelting, which
is why most forging shops buy UNS S13800 billet rather than make it.

---

## 05 Heat-treatment conditions

| Condition | Cycle | Notes |
|---|---|---|
| A | 927 °C ±8 °C, ~1 h, cool below 16 °C | Sections under ~230 cm² may be liquid quenched, larger sections air cooled. Must transform fully to martensite |
| RH950 | Cool Condition A material to −73 °C for ≥2 h within 24 h of solution treatment, warm in air, age 510 °C ±6 °C for 4 h, air cool | Highest strength. The cold hold eliminates retained austenite, which optimises the aging response |
| H950 | 510 °C, 4 h, air cool | Highest-strength single-step condition |
| H1000 | 538 °C, 4 h, air cool | Lowest aging temperature recommended where SCC governs |
| H1025 | 552 °C, 4 h, air cool | Intermediate strength |
| H1050 | 566 °C, 4 h, air cool | Common balance of strength and toughness |
| H1100 | 593 °C, 4 h, air cool | Higher toughness |
| H1150 | 621 °C, 4 h, air cool | Highest-toughness single-step condition. Overaged, will not respond to further aging |
| H1150M | 760 °C, 2 h, air cool, then 621 °C, 4 h, air cool | Highest impact energy and best machinability. Overaged; further aging needs re-solution treatment |

Rolled Alloys gives the solution treatment as 913–941 °C for 15–30 min with air cooling or an oil
quench below 16 °C, and the aging tolerance as ±6 °C for 4 h ±15 min.

**Three points to settle before ordering.** H1150 and H1150M are terminal conditions, so material
supplied in either for easier machining must be re-solution treated at 927 °C before re-aging.
Hardness alone cannot separate H1150 from Condition A, because the H1150 range falls inside the
solution-treated range, so the certificate is the evidence. Aging produces a small contraction that
increases with aging temperature, so tight-tolerance features are better finish-machined after aging.

---

## 06 Mechanical properties

### Specified minima (AMS 5864 as tabulated by Rolled Alloys)

| Property | H950 | H1000 | H1025 | H1050 | H1100 | H1150 |
|---|---|---|---|---|---|---|
| Yield 0.2 %, ksi | 205 | 190 | 175 | 165 | 135 | 90 |
| Yield 0.2 %, MPa | 1414 | 1310 | 1207 | 1138 | 931 | 621 |
| Tensile, ksi | 220 | 205 | 185 | 175 | 150 | 135 |
| Tensile, MPa | 1517 | 1414 | 1276 | 1207 | 1034 | 931 |
| Elongation in 50 mm, % | 10 | 10 | 11 | 12 | 14 | 14 |
| Reduction of area, longitudinal, % | 45 | 50 | 50 | 50 | 50 | 50 |
| Reduction of area, transverse, % | 45 | 50 | 50 | 50 | 50 | 50 |
| Reduction of area, short transverse, % | 35 | 40 | 45 | 45 | 50 | 50 |
| Hardness, min | 45 HRC | 43 HRC | – | 40 HRC | 34 HRC | 30 HRC |

*Metric converted at 1 ksi = 6.895 MPa and rounded. Confirm against the edition of AMS 5629,
ASTM A705 or AMS 5864 named on the purchase order.*

### Typical longitudinal properties at room temperature

| Condition | Yield, MPa | Tensile, MPa | Elongation, % | Reduction of area, % | Hardness, HRC | Charpy V, J |
|---|---|---|---|---|---|---|
| RH950 | 1482 | 1620 | 12 | 45 | 48 | 27 |
| H950 | 1448 | 1551 | 12 | 50 | 47 | 27 |
| H1000 | 1413 | 1482 | 13 | 55 | 45 | 41 |
| H1050 | 1241 | 1310 | 15 | 55 | 43 | 68 |
| H1100 | 1034 | 1103 | 18 | 60 | 35 | 81 |
| H1150 | 724 | 1000 | 20 | 63 | 33 | 103 |
| H1150M | 586 | 896 | 22 | 70 | 32 | 163 |

*High Temp Metals PH 13-8 Mo technical data. Typical values, not minima; design to the table above.
Tensile modulus in H1000 is 195 GPa.*

Transverse values sit close to the longitudinal ones. In H1000 the transverse yield strength matches
the longitudinal figure and reduction of area is 50 % against 55 %. That near-isotropy is the
commercial argument for the grade, and the reason it appears on drawings for thick landing-gear
sections, trunnions, actuator cylinders and critical valve parts.

### Typical torsional properties

| Condition | Yield at 0.2 % shear strain | Yield at 0.2 % normal strain | Modulus of rupture | Modulus of rigidity |
|---|---|---|---|---|
| H950 | 945 MPa | 1020 MPa | 1269 MPa | 76.5 GPa |
| H1000 | 924 MPa | 986 MPa | 1186 MPa | 75.2 GPa |

*Published as 137, 148, 184 and 11.1 × 10³ ksi for H950 and 134, 143, 172 and 10.9 × 10³ ksi for
H1000. Useful for shaft and valve-stem torque checks.*

---

## 07 Physical properties

| Property | Value | Condition or temperature |
|---|---|---|
| Density | 7.72–7.76 g/cm³ (0.279–0.280 lb/in³) | Rolled Alloys 0.279, High Temp Metals 0.280 |
| Melting range | 1404–1471 °C (2560–2680 °F) | – |
| Dynamic modulus | 200 GPa (29.0 × 10⁶ psi) | 21 °C |
| Dynamic modulus | 194 GPa (28.1 × 10⁶ psi) | 100 °C |
| Tensile modulus | 195 GPa | H1000 |
| Modulus of rigidity | 76.5 GPa (H950), 75.2 GPa (H1000) | Room temperature |
| Thermal conductivity | 8.6 Btu·ft/ft²·h·°F, about 14.9 W/m·K | 21 °C |
| Thermal conductivity | 10.4 Btu·ft/ft²·h·°F, about 18.0 W/m·K | 300 °C |
| Coefficient of thermal expansion | 7.2 × 10⁻⁶ in/in·°F at 100 °C rising to 7.8 at 300 °C, as published | Mean from 21 °C |
| Electrical resistivity | 613 ohm·circ mil/ft, about 1.02 µΩ·m | Condition A |
| Magnetic response | Ferromagnetic in all conditions | – |

*Expansion is reproduced in the published imperial form; confirm against the governing
specification before using it in a design calculation.*

---

## 08 Corrosion behaviour

Rusting resistance in salt fog in H950 is similar to Type 304, and general corrosion resistance in
oxidising and reducing acids and in atmospheric exposure approaches Type 304. Resistance is highest
in the fully hardened condition and falls slightly as aging temperature rises. Where
stress-corrosion cracking governs, age at 538 °C or above.

In bent-beam exposure at Kure Beach, specimens aged at 538 and 566 °C survived long-term exposure
at stress levels up to the yield strength without failure, while specimens aged at the lowest
temperature produced scattered failures. Specimens that were welded and then aged directly failed
early; specimens solution treated again after welding and then aged showed no failures.

**Practical consequence:** if a PH13-8Mo part is welded and will carry sustained stress in a
chloride-bearing environment, the welded assembly must go back through 927 °C solution treatment
before aging.

**Elevated temperature:** oxidation resistance is good to roughly 593 °C. Long exposure between
about 288 and 482 °C can reduce toughness in precipitation-hardenable stainless steels. For best
corrosion resistance, surfaces must be free of scale and embedded iron, and finished parts should
be passivated.

**Sour service is not a property of the grade.** NACE MR0175 and ISO 15156-3 list
precipitation-hardening stainless steels with named heat-treatment conditions, hardness ceilings
and limits on hydrogen sulfide partial pressure, chloride concentration, pH and temperature.
Acceptance is tied to the condition and the environment, not the grade, and editions change. Send
the H2S partial pressure, chloride level, pH and maximum temperature with the enquiry.

---

## 09 Forging, machining and welding

### Forging parameters

| Item | Requirement |
|---|---|
| Heating | Heat uniformly to 1177–1204 °C, soak 1 h before forging |
| Finishing temperature | Do not forge below 954 °C |
| Cooling after forging | Air cool to about 16 °C before further processing |
| Mandatory step | Forgings must be solution treated before aging |
| Cutting | Cold saw bars and billets; abrasive-wheel cutting can start surface cracks |
| Descaling | Acid clean or grit blast, then bake 1–3 h at 150–177 °C to release hydrogen |

### Machining

In Condition A the alloy gives good tool life and finish, but at surface speeds 20–30 % below
Custom 630 and 20–30 % below Types 302 and 304. Machinability in the aged conditions improves as
aging temperature rises, and H1150M gives the best machinability of the aged conditions.

Published high-speed-steel starting points for solution-treated material: about 18 m/min for
turning, cut-off and forming; 15 m/min for drilling; 27 m/min for end and peripheral milling at
1.3 mm depth of cut; 3 m/min for broaching. Carbide tooling allows surface speeds two to three
times higher and feeds 50–100 % higher.

*Correction to the earlier version of this page: it said the grade machines much like Types 302,
303, 410, 420, 430 and 430F. The published guidance is 20–30 % slower than 302 and 304 and
20–30 % slower than 17-4PH. Rough in Condition A or H1150M, then age.*

### Welding

Inert-gas shielded or resistance welding. Matching PH 13-8 filler gives weld properties close to
the base metal; an austenitic filler such as E/ER308L can be considered where high weld strength is
not needed. Preheat is usually unnecessary. Avoid sharp corners, threads and partial-penetration
welds. Welding in the solution-annealed condition is normal and the part can then be aged. Material
welded in the overaged H1150 condition must be solution treated before aging.

---

## 10 Applications

Published application lists for UNS S13800 centre on valve parts and fittings, cold-headed and
machined fasteners, shafts, pins, aircraft components and landing-gear structure, nuclear reactor
components, injection-moulding tooling, and petrochemical equipment where resistance to
stress-corrosion cracking matters. The selection rule is high strength, toughness and corrosion
resistance together with little directionality in properties.

- **Aerospace and landing gear** — struts, trunnions, axles, actuator cylinders, airframe fittings, machined fasteners. AMS 5629 is the usual specification.
- **Valves, wellhead, petrochemical** — stems, seat rings, bodies, bonnets, blocks for ball, gate, globe, check and plug valves; pump parts where SCC governs.
- **Shafts and rotating parts** — pump and plunger-pump shafts, spindles, eccentric shafts, pins.
- **Nuclear and power** — reactor components, high-integrity fasteners and fittings.
- **Tooling** — injection-moulding equipment.
- **Marine atmosphere** — components under sustained stress, aged at 538 °C or above.

**Where the grade is the wrong answer:** not for prolonged service above roughly 593 °C, and the
288–482 °C band should be avoided for long holds. For strength at temperature, consider A286
(/Stainless-Steel/A286.html). Where the section is thin enough that transverse properties are not
the deciding factor, 17-4PH or 15-5PH is usually the better commercial choice.

---

## 11 Against the other PH grades

| Grade | UNS | Peak condition | Tensile min | Yield min | Distinguishing feature |
|---|---|---|---|---|---|
| PH13-8Mo | S13800 | H950 | 1517 MPa | 1414 MPa | Highest strength of the group, near-isotropic ductility in heavy sections, vacuum melted, short-transverse RA specified |
| 17-4PH | S17400 | H900 | 1310 MPa | 1170 MPa | General industrial grade, lowest cost, widest availability, H1150-M used for sour service |
| 15-5PH | S15500 | – | – | – | Lower-ferrite variant of 17-4PH for better transverse toughness in heavy forgings |
| 17-7PH | S17700 | – | – | – | Semi-austenitic, mainly a sheet, strip and spring grade |

*15-5PH and 17-7PH cells are left blank rather than estimated; see those pages for verified figures.*

Selection logic: start with 17-4PH and move to PH13-8Mo when the section is heavy and the drawing
calls out transverse or short-transverse properties, or the required strength exceeds what H900 will
give, or the specification itself names AMS 5629 or UNS S13800.

---

## 12 Testing and certification

| Discipline | Equipment | Standard |
|---|---|---|
| Chemical analysis | Mobile optical emission spectrometer, SPECTROTEST TXC25 | ASTM E415 |
| Carbon and sulfur | Infrared analyser, HIR-9440D | ASTM E1019 |
| Alloy verification | Handheld analyser, X-Mwt3000TX | Positive material identification |
| Tensile | 600 kN hydraulic and 300 kN electronic universal testing machines | ASTM A370, ISO 6892 |
| Impact | Pendulum tester with low-temperature bath, JBN-300 and DWC-60 | ASTM A370, to −60 °C |
| Hardness | Leeb tester TH140 with conversion | ASTM A956, ASTM E140 |
| Ultrasonic | PXUT-3300, USM35XS, CTS-22 flaw detectors | ASTM A388, EN 10228-3 |
| Magnetic particle | CYE-3A crack detector | ASTM E709 |
| Metallography | XJP-6A microscope with mounting press, pre-grinder, polisher | ASTM E112 grain size |

EN 10204 3.1 mill certificates are standard; EN 10204 3.2 witnessed by BV, DNV, LR, SGS, TUV or the
buyer's inspector is available on request. The works holds CCS, BV, DNV, LR and NK approvals.
Because the steel is melted on site, the certificate traces the part to its own heat number.

Tests outside this scope (ASTM A262, G28, G48, impact below −60 °C, bench Brinell or Rockwell) are
placed with an accredited third-party laboratory and reported with the mill certificate.

**Surface treatment.** Nitriding and other surface treatments can be applied where wear, galling or
fatigue life govern. Surface hardness and case depth are quoted against the procedure agreed for
the specific part and verified on a coupon, because results depend on the aging condition, the
process route and the section. A nitriding cycle run above the aging temperature will overage the core.

---

## 13 How to order

Minimum order 10 kg with no minimum piece count. Normal lead time 20–60 days, UNS S13800 at the
upper end because of the remelting step. Six items for a firm price, normally within two working days:

1. **Specification** — ASTM A705 Type XM-13, AMS 5629 or EN 1.4534. Not ASTM B564.
2. **Melt route** — single melt, vacuum induction melting plus vacuum arc remelting, or electroslag remelted.
3. **Dimensions or drawing** — e.g. 620 mm OD × 420 mm ID × 180 mm high, or PDF, DWG, DXF, STEP with tolerances, surface roughness and any grain-flow requirement.
4. **Delivery condition** — Condition A, H1150M for machining, or final aged RH950, H950, H1000, H1025, H1050, H1100 or H1150.
5. **Heat treatment and testing** — e.g. solution 927 °C then age H1000; ultrasonic to EN 10228-3; transverse Charpy at a stated temperature.
6. **Certification and destination** — EN 10204 3.1 or 3.2 with witnessing body, any NACE review, quantity, required date, destination port.

**Contact:** sales@steelforgepieces.com · 0086-189-2135-9659 · WhatsApp +86 189 2135 9659
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province 214423, China
Wuxi Shuofang airport 30 km, Shanghai airports 160 km

---

## 14 Questions

**Which specification should be cited on a forging order?**
ASTM A705 Type XM-13, or AMS 5629 for aerospace work. ASTM A564 Type XM-13 covers bars and shapes,
ASTM A693 Grade XM-13 flat products, AMS 5864 sheet, strip and plate. ASTM B564 covers nickel-alloy
forgings and does not apply, despite appearing on several supplier pages for this grade.

**What heat-treatment conditions exist?**
Condition A, RH950, H950, H1000, H1025, H1050, H1100, H1150 and H1150M. H900, H925 and H1075 belong
to 17-4PH and are sometimes listed for this grade in error.

**Is PH13-8Mo stronger than 17-4PH?**
Yes. H950 specifies 1,517 MPa minimum tensile against 1,310 MPa for 17-4PH H900, and RH950 reaches
about 1,620 MPa typical. The bigger practical difference is ductility in heavy sections.

**Is double melting required?**
Normally yes, vacuum induction melting followed by vacuum arc remelting, because the specification
depends on very low carbon, manganese, silicon, sulfur, phosphorus and nitrogen and on low
segregation. We run a 3 t VIM furnace, a 6 t VAR furnace and 3 t and 6 t ESR furnaces on site.

**What is the largest forging available?**
Plant limits are 30 t single-piece weight and rolled rings to 6,000 mm outside diameter. For UNS
S13800 the clean-melt ingot governs: the 3 t VIM and 6 t VAR furnaces set the ceiling for
double-melt material.

**Can it be used in sour service?**
Not by assumption. Acceptance under NACE MR0175 / ISO 15156-3 is tied to the heat-treatment
condition and the environment, not the grade. Send the H2S partial pressure, chloride level, pH and
maximum temperature with the enquiry.

**Can it be welded?**
Yes, by inert-gas shielded or resistance welding. Material welded in the overaged H1150 condition
must be re-solution treated before aging. Aging straight after welding gives much poorer
stress-corrosion performance than solution treating the welded assembly first.

**What ultrasonic testing and certification can be supplied?**
ASTM A388 or EN 10228-3, with magnetic particle to ASTM E709. EN 10204 3.1 standard, 3.2 witnessed
on request. CCS, BV, DNV, LR and NK approvals.

**Why does the drawing say 1.4534 or X3CrNiMoAl13-8-2?**
Those are the European material number and name for the same chemistry as UNS S13800.

---

## 15 Sources

- Rolled Alloys, *Data Sheet 13-8 Stainless*, Bulletin 1022USe — chemistry, physical properties, heat-treating parameters, minimum mechanical properties to AMS 5864.
- High Temp Metals, *PH 13-8 Mo technical data* — type analysis, corrosion and stress-corrosion behaviour, physical properties, cycle definitions, typical longitudinal, transverse and torsional properties, workability and machining parameters.
- ASTM A564/A564M Type XM-13; ASTM A705/A705M Type XM-13; ASTM A693 Grade XM-13.
- SAE AMS 5629; SAE AMS 5864.
- EN 10088-3 for 1.4534 and X3CrNiMoAl13-8-2; ASTM A388 and EN 10228-3 for ultrasonic testing; EN 10204 for certificate types.
- Jiangyin Jiangnan Metal Co., Ltd. equipment register, laboratory register and production records for all capability, size, lead-time and certification statements.

**Citation:** Jiangyin Jiangnan Metal Co., Ltd., "PH13-8Mo Forgings, UNS S13800, AMS 5629, ASTM A705
Type XM-13, EN 1.4534", steelforgepieces.com, revised 3 October 2026,
https://www.steelforgepieces.com/Stainless-Steel/PH13-8Mo.html

**Trademark notice:** PH 13-8 Mo, 17-4 PH, 15-5 PH and 17-7 PH are registered trademarks of
Cleveland-Cliffs Inc. Material produced by Jiangyin Jiangnan Metal Co., Ltd. is correctly described
as UNS S13800 / ASTM A564 Type XM-13 / ASTM A705 Type XM-13 / AMS 5629 / EN 1.4534, the same generic
chemistry, manufactured independently. No affiliation with or endorsement by any trademark holder.

**Technical note:** data is cited to its sources and believed reliable, but does not replace
engineering assessment of a specific application and is not a warranty of performance.