# 30CND8 Forgings: 30CrNiMo8 rings, flanges, shafts, discs and bars

Werkstoff 1.6580 · EN 30CrNiMo8 · AFNOR 30CND8 / 30NCD8 · BS 823M30 · JIS SNCM431

Supplier: **Jiangyin Jiangnan Metal Co., Ltd.**, open-die forging factory
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Tel +86-189-2135-9659 · sales@steelforgepieces.com · http://www.steelforgepieces.com/
Page: http://www.steelforgepieces.com/Alloy-Steel/30CND8.html
Last reviewed: 10 September 2026

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## Summary

30CND8 is the French AFNOR name for the chromium-nickel-molybdenum quenching and tempering steel
designated 30CrNiMo8 in the EN system, material number 1.6580. Two per cent chromium, two per cent
nickel and 0.4 per cent molybdenum give it enough hardenability to harden through sections that
leaner steels only skin-harden, at a carbon level low enough to keep impact values after tempering.
Jiangyin Jiangnan Metal Co., Ltd. open-die forges 30CND8 to drawing as seamless rolled rings, forged
rings, flanges, round bars, discs, shafts, sleeves, bushings and tube sheets. Material is melted
EAF + LF + VD and released with EN 10204 3.1 or 3.2 certification.

Key figures:

- 900 MPa minimum tensile strength, forged and quenched and tempered to 250 mm, EN 10250-3
- 45 HRC reached after tempering at 450 °C
- 5 kg to 20 t single-piece forging weight range
- 4,000 mm largest seamless rolled ring outside diameter

## 30CND8 at a glance

| Item | Detail |
|---|---|
| Also called | 30CrNiMo8, 1.6580, 30NCD8, 823M30, SNCM431, 30Cr2Ni2Mo, 30KhN2MA |
| Alloy type | Cr-Ni-Mo steel for quenching and tempering, very high hardenability |
| Carbon | 0.26 to 0.34 % |
| Chromium / nickel | 1.80 to 2.20 % each |
| Standards | EN 10083-3, EN 10250-3 (open-die forgings), ISO 683-2, EN 10269, EN 10297-1, ASTM A320 grade L43 |
| Melting route | EAF + LF + VD, ESR where the specification calls for it |
| Delivery condition | Quenched and tempered; also normalised, soft annealed or as forged |
| Density | 7.85 g/cm³ |
| Forms forged | Rings, flanges, bars, discs, shafts, sleeves, bushings, tube sheets, blocks |
| Supplier | Jiangyin Jiangnan Metal Co., Ltd., Jiangsu, China |

## What is 30CND8?

30CND8 is the AFNOR designation for the steel the EN system calls 30CrNiMo8 and the German Werkstoff
system numbers 1.6580. It is a wrought low-alloy steel supplied quenched and tempered, used where a
part carries high static and fatigue loads in a heavy section.

The alloy content is what makes the grade worth its price. Chromium and molybdenum push the nose of
the transformation curve to the right so the centre of a thick part still transforms to martensite on
an oil quench. Nickel raises toughness in the tempered structure and lowers the ductile-brittle
transition. Carbon stays at 0.26 to 0.34 per cent, well below the 0.40 per cent typical of 4140 and
4340, which is why 30CND8 gives up a little peak hardness and gets back impact energy.

Hardenability is the practical reason engineers specify it. On the Jominy end-quench test to
ISO 683-2, the H band for 30CND8 holds 48 HRC minimum at 1.5 mm from the quenched end and still
43 HRC minimum at 50 mm. In a 400 mm forged shaft the difference between surface and core properties
is small enough to design around.

### Where 30CND8 sits among quench and temper steels

42CrMo4 and 4140 sit below it. They cost less and machine more easily, but they cannot hold full
properties much past 100 mm ruling section. 34CrNiMo6 sits between the two, with about half the
nickel and chromium of 30CND8. Above 30CND8 are the higher-alloy and vacuum-remelted grades used in
aerospace, at a step change in price. 30CND8 is the usual answer when 34CrNiMo6 has run out of
section and the budget will not stretch to a remelted grade.

## 30CND8 designations, equivalents and standards

| System | Designation | Notes |
|---|---|---|
| DIN / EN Werkstoff-Nr. | 1.6580 | Primary European material number |
| EN designation | 30CrNiMo8 | Used in EN 10083-3 and EN 10250-3 |
| France, AFNOR | 30CND8, 30NCD8 | Original French designation |
| United Kingdom, BS 970 | 823M30 | Direct equivalent |
| Japan, JIS G4103 | SNCM431 | Close equivalent |
| Italy, UNI | 30CrNiMo8, 30NiCrMo8 | Close equivalent |
| China, GB/T 3077 | 30Cr2Ni2Mo | Closest domestic grade |
| Russia, GOST 4543 | 30KhN2MA | Close equivalent |
| USA, ASTM | A320 grade L43 | Bolting for low-temperature service of this composition |
| Related EN grade | 31CrNiMo8 | Slightly higher carbon variant |
| Product standards | EN 10083-3, EN 10250-3, ISO 683-2, EN 10269, EN 10297-1 | Bar, open-die forgings, hot-rolled product, fasteners, seamless tube |

**Ordering note.** EN 10083-3 and ISO 683-2 cover rolled bar. A 30CND8 forging is normally ordered to
EN 10250-3 plus your drawing and acceptance criteria. State the ruling section, the tensile and
impact minima, the sampling direction and the NDT class on the enquiry and they will be written into
the mill certificate.

## Chemical composition of 30CND8

Weight per cent, cast analysis to EN 10083-3 and ISO 683-2. The aim column is the mid-range chemistry
Jiangyin Jiangnan Metal melts to for forging stock.

| Element | Symbol | Specified range | Typical aim |
|---|---|---|---|
| Carbon | C | 0.26 to 0.34 | 0.30 |
| Silicon | Si | 0.10 to 0.40 | 0.25 |
| Manganese | Mn | 0.50 to 0.80 | 0.65 |
| Chromium | Cr | 1.80 to 2.20 | 2.00 |
| Nickel | Ni | 1.80 to 2.20 | 2.00 |
| Molybdenum | Mo | 0.30 to 0.50 | 0.40 |
| Copper | Cu | ≤ 0.40 | – |
| Phosphorus | P | ≤ 0.025 | – |
| Sulphur | S | ≤ 0.035 | – |
| Iron | Fe | balance | ~93 |

Sulphur is capped at 0.035 per cent in the standard, but forgings for pressure, subsea or low
temperature duty are normally ordered to 0.015 per cent or lower. Ask for the restricted analysis on
the enquiry rather than after the heat is melted.

## Mechanical properties of 30CND8

### Forged and quenched and tempered, EN 10250-3

This is the table that applies to an open-die forging. L is longitudinal, T tangential.

| Ruling section d / t (mm) | Rm min (MPa) | Rp0.2 min (MPa) | A min L (%) | A min T (%) | KV min L (J) | KV min T (J) | HB |
|---|---|---|---|---|---|---|---|
| up to 250 / 160 | 900 | 700 | 12 | 8 | 45 | 22 | 271 |
| 250 / 160 to 500 / 330 | 850 | 630 | 12 | 8 | 45 | 22 | 253 |
| 500 / 330 to 990 / 660 | 800 | 590 | 12 | 8 | 40 | 20 | 240 |

d is diameter, t is thickness. Hardness figures are for information rather than acceptance.

### Hot-rolled bar, quenched and tempered, ISO 683-2

| Size d / t (mm) | Rm (MPa) | Rp0.2 min (MPa) | A min (%) | Z min (%) | KV min (J) |
|---|---|---|---|---|---|
| up to 16 / 8 | 1030 to 1230 | 850 | 12 | 40 | – |
| 16 / 8 to 40 / 20 | 1030 to 1230 | 850 | 12 | 40 | 30 |
| 40 / 20 to 100 / 60 | 980 to 1180 | 800 | 12 | 45 | 35 |
| 100 / 60 to 160 / 100 | 980 to 1180 | 800 | 12 | 50 | 45 |
| 160 / 100 to 250 / 160 | 930 to 1130 | 750 | 12 | 50 | 45 |

### Tempering response

Measured on 10 mm rounds quenched from 850 °C in oil, so these show the ceiling for the grade rather
than what a 500 mm forging will reach at its core.

| Tempering temperature | 450 °C | 500 °C | 550 °C | 600 °C | 650 °C | 700 °C |
|---|---|---|---|---|---|---|
| Hardness HB | 426 | 404 | 381 | 347 | 275 | 240 |
| Hardness HRC | 45 | 43 | 41 | 37 | 28 | 23 |
| Rm (MPa) | 1500 | 1400 | 1290 | 1150 | 920 | 800 |
| Rp0.2 (MPa) | 1350 | 1250 | 1090 | 960 | 780 | 640 |
| Elongation A (%) | 10.0 | 10.0 | 11.0 | 14.0 | 16.0 | 18.0 |
| Reduction of area Z (%) | 42 | 45 | 48 | 50 | 52 | 52 |
| Impact KV (J) | 20 | 50 | 60 | 75 | 80 | 92 |

**Design note.** Strength and toughness move in opposite directions across that table. Tempering at
450 °C buys 1500 MPa and leaves 20 J of impact energy; tempering at 600 °C trades 350 MPa for nearly
four times the toughness. Fix the property you actually need on the drawing, and the tempering cycle
follows from it.

### Low-temperature impact behaviour

Typical Charpy V values on a 32 mm round quenched and tempered to Rm 1260 MPa, given as an indication
of transition behaviour rather than as a specification requirement.

| Test temperature | +20 °C | 0 °C | −20 °C | −40 °C | −60 °C | −80 °C |
|---|---|---|---|---|---|---|
| Average KV (J) | 66 | 49 | 42 | 33 | 28 | 27 |

Order low-temperature impact testing explicitly if the part runs below zero. Jiangyin Jiangnan Metal
Co., Ltd. tests to the temperature stated on the order and reports the individual and average values
on the certificate.

## Physical properties of 30CND8

At 20 °C, to DIN SEW 310.

| Property | Value (metric) | Value (imperial) |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Modulus of elasticity | 212 GPa | 30.7 × 10⁶ psi |
| Shear modulus | 81 GPa | 11.7 × 10⁶ psi |
| Thermal conductivity | 33.7 W/m·K | 19.5 Btu/hr·ft·°F |
| Specific heat capacity | 461 J/kg·K | 0.110 Btu/lb·°F |
| Electrical resistivity | 0.309 Ω·mm²/m | 30.9 µΩ·cm |
| Thermal expansion, 20 to 100 °C | about 11.5 × 10⁻⁶ K⁻¹ | 6.4 × 10⁻⁶ °F⁻¹ |
| Magnetic response | Ferromagnetic in all delivery conditions | |

Transformation temperatures: Ac1 720 °C, Ac3 770 °C, Ms 310 °C, Mf 100 °C.

Physical constants are typical published values for the grade. The values on your mill certificate
govern for acceptance.

## 30CND8 forged product forms and size ranges

Jiangyin Jiangnan Metal Co., Ltd. forges 30CND8 to drawing rather than from a stock list. The ranges
below cover the working envelope of the presses and the ring mill.

| Product form | Description | Size range |
|---|---|---|
| Seamless rolled rings | Radial-axial rolled from a punched, upset blank. Grain flow follows the circumference | OD 200 to 4,000 mm, height to 1,000 mm |
| Forged rings | Press-forged and bored where the section is too heavy or the ratio too short to roll | OD 100 to 3,000 mm |
| Forged flanges | Weld-neck, blind, slip-on and special profiles, forged and rough machined | 50 to 3,000 mm |
| Round bars | Drawn under the press, straightened, peeled or turned as required | Ø 20 to 1,200 mm, length to 12,000 mm |
| Discs and blanks | Upset discs for gear blanks, valve seats, closures and coupling hardware | Ø 100 to 2,500 mm |
| Shafts and spindles | Stepped shafts, eccentric shafts, pinion shafts and spindles with full-length grain flow | Ø 60 to 1,000 mm |
| Sleeves and bushings | Hollow forgings, trepanned or mandrel-forged to cut machining loss | OD 100 to 2,000 mm |
| Tube sheets | Heavy plate-form forgings, ultrasonically tested before drilling | to 3,000 mm, to 400 mm thick |
| Forged pipes and hollows | Hollow-forged and bored sections for thick-wall cylinders and pressure parts | OD 100 to 1,500 mm |

Single-piece weight: 5 kg to 20,000 kg. Also produced in this grade: valve bodies, valve stems, valve
seat rings, crankshafts, gears, blocks, nozzles and custom open-die forged parts.

## How Jiangyin Jiangnan Metal produces 30CND8 forgings

1. **Melting: EAF + LF + VD.** Electric arc melting, ladle refining and vacuum degassing. Degassing
   pulls hydrogen down far enough to keep heavy 30CND8 sections free of flaking, which is the usual
   failure mode when this grade is forged from gassy stock. ESR is added where the specification calls
   for it.
2. **Open-die forging: 1,050 to 880 °C.** Soak, then upset and draw to break down the as-cast
   structure. Reduction ratio is agreed on the order and is normally 3:1 or better. Forging finishes
   above 880 °C and the piece goes to controlled cooling rather than being left in still air.
3. **Ring rolling or profiling.** Ring blanks are punched, upset and rolled on the radial-axial mill so
   grain flow runs round the circumference. Bars, shafts and discs are drawn or upset under the press
   to the rough-machining envelope.
4. **Heat treatment.** Harden from 830 to 860 °C, quench in oil or polymer, temper 540 to 660 °C to
   the strength band on the order. Heavy sections get double tempering and an intermediate stress
   relief after rough machining. Furnace charts are calibrated and recorded.
5. **Rough machining.** Turned or milled to your drawing with test-piece material and a UT scanning
   surface left on.
6. **Testing and certification.** Spectrographic chemistry, tensile, impact and hardness testing at the
   sampling position agreed for the ruling section. Ultrasonic testing to EN 10228-3, SEP 1921 or
   ASTM A388. Released with an EN 10204 3.1 mill certificate, or EN 10204 3.2 witnessed by TUV, BV,
   SGS or Lloyd's Register on request.

## What 30CND8 forgings are used for

| Industry | Forged components | Why 30CND8 |
|---|---|---|
| Oil and gas drilling | Down-hole and ultra-deep casing components, drill collars, subs, wellhead and Christmas tree parts, forged flanges | Full through-hardening in thick wall sections carrying combined torque and tension |
| Subsea and offshore | Deepwater production hardware, hubs, connectors, sleeves and bushings | High strength with impact values held down to sub-zero service |
| Valves and flow control | Valve bodies, stems, seat rings, blocks and closures for ball, gate, globe, check and plug valves | Strength in the pressure envelope plus a machinable annealed condition |
| Power transmission | Gears, gear blanks, pinion shafts, gearbox shafts, couplings, torque-carrying pins | Core hardness under a case, and fatigue strength on the tooth root |
| Rotating equipment | Seamless rolled rings, spindles, compressor rotors and shafts | Circumferential grain flow from ring rolling, plus deep hardening on large diameters |
| Power generation | Turbine and generator shafting, coupling forgings, heavy fasteners and studs | Consistent properties from rim to bore on large diameters |
| Process and chemical plant | Tube sheets, nozzles, forgings for columns, towers, preheaters and crystalliser equipment | Heavy plate-form forgings with certified through-thickness properties |
| Marine and heavy machinery | Propulsion shafting, rudder stocks, crankshafts, eccentric shafts, press and mill parts | Fatigue strength and toughness in long forged sections |

## 30CND8 compared with 42CrMo4, 34CrNiMo6, 4140 and 4340

| Grade | C % | Cr % | Ni % | Mo % | Practical ruling section | Relative cost |
|---|---|---|---|---|---|---|
| 30CND8 / 30CrNiMo8 | 0.30 | 2.00 | 2.00 | 0.40 | Deepest of this group, used to 990 mm under EN 10250-3 | Mid to high |
| 34CrNiMo6 / 1.6582 | 0.34 | 1.50 | 1.50 | 0.22 | Good to roughly 250 mm | Mid |
| AISI 4340 | 0.40 | 0.80 | 1.80 | 0.25 | Similar to 34CrNiMo6, higher peak hardness | Mid |
| 42CrMo4 / 1.7225 | 0.42 | 1.05 | – | 0.22 | Falls away past about 100 mm | Low |
| AISI 4140 | 0.40 | 0.95 | – | 0.20 | Falls away past about 100 mm | Low |

Composition figures are nominal and given for orientation. Grade selection for a pressure or
safety-critical part should be made against the applicable design code and the service conditions
rather than from a summary table.

### The 4340 question

Buyers often treat 30CND8 and AISI 4340 as the same steel. They are not. Nickel is close, but 30CND8
carries roughly twice the chromium and about a quarter less carbon. In service that means 30CND8
tempers to a lower peak hardness and keeps more impact energy at the same tensile level, while 4340
will reach a higher hardness on a small section. Jiangyin Jiangnan Metal Co., Ltd. quotes both, and
swaps one for the other only when the design authority approves it in writing.

## Machining, welding and hot working

**Machining.** Machine 30CND8 soft annealed at 248 HB or under for heavy stock removal, then finish in
the final quenched and tempered condition. At 300 HB and above use carbide tooling, rigid setups,
positive rake and a steady feed. Rough machine before the final temper where the part has deep pockets
or thin webs, and stress relieve about 50 °C below the tempering temperature before finishing.

**Welding.** 30CND8 has a high carbon equivalent and is not a readily weldable grade. Where welding
cannot be avoided, preheat to about 300 °C, hold the interpass temperature, use low-hydrogen
consumables, and stress relieve after welding at about 550 °C with furnace cooling, keeping the stress
relief below the original tempering temperature. Qualify the procedure before production.

**Hot working.** Forge between 1,050 and 880 °C. Do not finish below 880 °C and do not attempt to
reheat and continue at the bottom of the range. Cool controlled rather than in still air after
forging, then normalise or harden and temper as the order requires.

## Frequently asked questions

**What is material 30CND8?**
30CND8 is the French AFNOR designation for a chromium-nickel-molybdenum steel for quenching and
tempering, designated 30CrNiMo8 in the EN system and carrying Werkstoff material number 1.6580. It
contains 0.26 to 0.34% carbon, 1.80 to 2.20% chromium, 1.80 to 2.20% nickel and 0.30 to 0.50%
molybdenum. The grade is known for very high hardenability, which lets it harden through heavy
sections that leaner steels cannot. Jiangyin Jiangnan Metal Co., Ltd. open-die forges 30CND8 to
drawing at its works in Jiangyin, Jiangsu, China.

**What is 30CND8 equivalent to?**
30CND8 is equivalent to EN 30CrNiMo8, Werkstoff 1.6580, BS 823M30 in the United Kingdom, SNCM431 in
Japan, 30Cr2Ni2Mo in China and 30KhN2MA in Russia. It is also written 30NCD8 in French practice, and
ASTM A320 grade L43 covers bolting of this composition. Jiangyin Jiangnan Metal Co., Ltd. accepts
enquiries placed under any of these designations.

**What is the chemical composition of 30CND8?**
30CND8 contains 0.26 to 0.34% carbon, 0.10 to 0.40% silicon, 0.50 to 0.80% manganese, 1.80 to 2.20%
chromium, 1.80 to 2.20% nickel, 0.30 to 0.50% molybdenum, up to 0.025% phosphorus, up to 0.035%
sulphur and up to 0.40% copper, with iron as the balance. The composition is specified in EN 10083-3
and ISO 683-2.

**What mechanical properties do 30CND8 forgings have?**
For open-die forgings to EN 10250-3 in the quenched and tempered condition, 30CND8 gives 900 MPa
minimum tensile strength and 700 MPa minimum proof strength up to 250 mm ruling section, 850 and
630 MPa from 250 to 500 mm, and 800 and 590 MPa from 500 to 990 mm. Minimum longitudinal elongation
is 12% and minimum longitudinal impact energy is 40 to 45 J. Higher strength is available on smaller
sections by tempering lower, and the values on the EN 10204 certificate issued by Jiangyin Jiangnan
Metal Co., Ltd. govern for acceptance.

**What heat treatment does 30CND8 need?**
30CND8 is hardened from 830 to 860 °C and quenched in oil or polymer, then tempered between 540 and
660 °C and cooled in air. Normalising is carried out at 870 to 880 °C with air cooling, and soft
annealing at 650 to 700 °C with slow furnace cooling to give a maximum hardness of 248 HB. Stress
relieving is run about 50 °C below the tempering temperature. Jiangyin Jiangnan Metal Co., Ltd. sets
the tempering temperature to the strength band stated on the order.

**How hard can 30CND8 be tempered?**
On a 10 mm round quenched from 850 °C in oil, 30CND8 tempers to about 45 HRC and 1500 MPa tensile
strength at 450 °C, 43 HRC and 1400 MPa at 500 °C, 41 HRC and 1290 MPa at 550 °C, 37 HRC and 1150 MPa
at 600 °C, and 23 HRC and 800 MPa at 700 °C. Impact energy rises as hardness falls, from about 20 J
at 450 °C to about 92 J at 700 °C.

**Can 30CND8 replace AISI 4340?**
Not directly. 30CND8 and AISI 4340 sit in the same Cr-Ni-Mo family and carry similar nickel, but
30CND8 has lower carbon, 0.26 to 0.34% against 0.38 to 0.43%, and roughly twice the chromium, 1.80 to
2.20% against 0.70 to 0.90%. 30CND8 tempers to a lower peak hardness and holds more toughness at the
same strength level. Jiangyin Jiangnan Metal Co., Ltd. quotes either grade but substitutes one for
the other only with written approval from the design authority.

**Is 30CND8 weldable?**
30CND8 has a high carbon equivalent and is not a readily weldable grade. Where welding cannot be
avoided, preheat to about 300 °C, use low-hydrogen consumables, and stress relieve after welding at
about 550 °C with furnace cooling, keeping the stress relief below the original tempering
temperature. Qualify the procedure before production. Jiangyin Jiangnan Metal Co., Ltd. can supply
the part as a single machined forging so that welded joints are avoided.

**What sizes of 30CND8 forgings can you supply?**
Jiangyin Jiangnan Metal Co., Ltd. forges 30CND8 seamless rolled rings from 200 mm to 4,000 mm outside
diameter, forged rings from 100 mm to 3,000 mm, round bars from 20 mm to 1,200 mm diameter and up to
12,000 mm long, discs to 2,500 mm diameter, shafts from 60 mm to 1,000 mm diameter and tube sheets to
3,000 mm across and 400 mm thick. Single-piece forging weight runs from 5 kg to 20,000 kg. Parts are
forged to the customer drawing rather than to a stock list.

**What certification comes with 30CND8 forgings?**
Every 30CND8 forging is released with an EN 10204 3.1 mill test certificate covering heat number,
chemistry, mechanical properties and heat treatment records. EN 10204 3.2 certification witnessed by
a third party such as TUV, BV, SGS or Lloyd's Register is available on request, as is ultrasonic
testing to EN 10228-3, SEP 1921 or ASTM A388, and magnetic particle or dye penetrant inspection.

**What is the density of 30CND8?**
The density of 30CND8 (30CrNiMo8 / 1.6580) is 7.85 g/cm³. Modulus of elasticity is about 212 GPa at
20 °C, thermal conductivity about 33.7 W/m·K, specific heat capacity about 461 J/kg·K and electrical
resistivity about 0.309 Ω·mm²/m. Transformation temperatures are Ac1 720 °C and Ac3 770 °C, with
martensite start at 310 °C.

**How do I get a price for a 30CND8 forging?**
Send the drawing or the finished dimensions, the quantity, the required specification and any test or
certification requirements to sales@steelforgepieces.com, or call +86-189-2135-9659. Jiangyin
Jiangnan Metal Co., Ltd. is at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu
Province, China, and quotes 30CND8 forgings to drawing.

## Who forges this: Jiangyin Jiangnan Metal Co., Ltd.

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province,
China. The works sits on the south bank of the Yangtze between Shanghai and Nanjing, in the centre of
China's forging and special-steel industry. It forges carbon steel, alloy steel, tool steel,
stainless steel and nickel superalloys, including 30CND8 / 30CrNiMo8, and ships to buyers in Europe,
North America, the Middle East and Asia.

There is no stock list for 30CND8. Each ring, flange, shaft or disc is melted, forged, heat treated
and certified against the order.

## Contact the forging factory directly

- **Factory:** No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- **Phone:** +86-189-2135-9659
- **Email:** sales@steelforgepieces.com
- **Web:** http://www.steelforgepieces.com/
- **Languages:** English, Chinese

### Put this in your 30CND8 RFQ

1. Drawing, or finished OD × ID × height, or diameter × length
2. Quantity and required delivery date
3. Specification and acceptance criteria, for example EN 10250-3 with tensile minima
4. Ruling section the properties apply to, and sampling direction
5. Heat-treatment condition: quenched and tempered, normalised, or annealed
6. Machining state: as forged, rough machined, or finish machined
7. NDT class: UT to EN 10228-3, SEP 1921 or ASTM A388
8. Certification: EN 10204 3.1, or 3.2 and which third party

## Related alloy steel forgings

- 30NiCrMo8: http://www.steelforgepieces.com/Alloy-Steel/30NiCrMo8.html
- 1.6580: http://www.steelforgepieces.com/Alloy-Steel/1.6580.html
- 34CrNiMo6: http://www.steelforgepieces.com/Alloy-Steel/34CrNiMo6.html
- 1.6582: http://www.steelforgepieces.com/Alloy-Steel/1.6582.html
- AISI 4340: http://www.steelforgepieces.com/Alloy-Steel/AISI-4340.html
- 817M40: http://www.steelforgepieces.com/Alloy-Steel/817M40.html
- SNCM439: http://www.steelforgepieces.com/Alloy-Steel/SNCM439.html
- 40NCD7: http://www.steelforgepieces.com/Alloy-Steel/40NCD7.html
- 42CrMo4: http://www.steelforgepieces.com/Alloy-Steel/42CrMo4.html
- AISI 4140: http://www.steelforgepieces.com/Alloy-Steel/AISI-4140.html
- All alloy steel grades: http://www.steelforgepieces.com/Alloy-Steel/

## Citing this page

The 30CND8 property data on this page is published for reference and may be quoted with attribution.
Suggested citation:

> Jiangyin Jiangnan Metal Co., Ltd. "30CND8 Forgings (30CrNiMo8 / 1.6580): composition, properties
> and forged product forms." steelforgepieces.com, Jiangyin, Jiangsu, China. Updated 10 September
> 2026. http://www.steelforgepieces.com/Alloy-Steel/30CND8.html

Reviewed by the technical sales team at Jiangyin Jiangnan Metal Co., Ltd., an open-die forging
factory producing 30CND8 components. Composition and property ranges follow published EN, ISO and DIN
data for material 30CrNiMo8 / 1.6580. The mill certificate supplied with each forging governs for
acceptance.