# 1.4935 (X20CrMoWV12-1) Creep-Resisting Steel Forgings: AISI 422, UNS S42200, SUH616

Supplier: Jiangyin Jiangnan Metal Co., Ltd., open-die forging works
Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, 214400
Phone: +86-189-2135-9659
Email: sales@steelforgepieces.com
Source page: https://www.steelforgepieces.com/Stainless-Steel/1.4935.html
Data to EN 10302:2008. Revised 27 September 2026.

1.4935 is the EN material number for X20CrMoWV12-1, a martensitic creep-resisting chromium steel
listed in EN 10302, the European standard covering creep resisting steels, nickel and cobalt alloys
in bar, rod and flat products. The grade runs 11.0 to 12.5 % chromium with additions of molybdenum,
tungsten and vanadium, which form carbides that resist coarsening at temperature. Nearest
counterparts abroad are AISI 422 and AISI 616 (UNS S42200) in the USA and SUH616 in Japan, although
their tungsten, carbon and nickel ranges differ. Continuous service is normally taken to about
580 C for creep and 600 C for scaling. Supply is quenched and tempered as +QT700 or +QT800. Main
work is steam and gas turbine blades, valve spindles and stems, rotor parts and hot bolting.

## Identification and basic data

| Item | Value |
| --- | --- |
| EN material number | 1.4935 |
| EN steel name | X20CrMoWV12-1 |
| Standard | EN 10302:2008 |
| Class | Martensitic creep-resisting alloy steel |
| Melting route available | ESR remelted on request |
| Density | 7.7 g/cm3 |
| Young's modulus | 216 GPa |
| Thermal conductivity | 24 W/(m*K) |
| Specific heat capacity | 460 J/(kg*K) |
| Coefficient of linear expansion | 10.5 to 12.5 x 10-6 m/(m*K) |
| Delivery conditions | +QT700, +QT800 |
| Weldability | Difficult, welding group 7.2 of ISO/TR 20172 |
| Main uses | Turbine blades, valve spindles, rotor parts, high-temperature fasteners |

## Chemical composition, % by mass, EN 10302:2008

| C | Si | Mn | P max | S max | Cr | Mo | Ni | V | W |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 0.17-0.24 | 0.10-0.50 | 0.30-0.80 | 0.025 | 0.015 | 11.0-12.5 | 0.80-1.20 | 0.30-0.80 | 0.20-0.35 | 0.40-0.60 |

Some supplier datasheets publish vanadium as 0.25 to 0.35 %. State the narrower range on the order
if the application needs it.

## Room-temperature mechanical properties

| Property | +QT700 | +QT800 |
| --- | --- | --- |
| Tensile strength Rm, MPa | 700-850 | 800-950 |
| Proof strength Rp0.2, MPa | 500 min | 600 min |
| Elongation A, % | 15 min | 14 min |

Minimum elongation varies with product form, ruling section and specimen direction.

## Minimum proof strength Rp0.2 at temperature, MPa, forgings

| Temperature, C | +QT700 | +QT800 |
| --- | --- | --- |
| 50 | 465 | 585 |
| 100 | 460 | 560 |
| 150 | 445 | 545 |
| 200 | 430 | 530 |
| 250 | 415 | 505 |
| 300 | 390 | 480 |
| 350 | 380 | 450 |
| 400 | 360 | 420 |
| 450 | 330 | 380 |
| 500 | 290 | 335 |
| 550 | 250 | 280 |

Creep-rupture strength: 275 MPa minimum for 100,000 h at 500 C. Use the creep-rupture and 1 % creep
limit tables of EN 10302 for design. The 580 C figure is a service guide, not a design allowable.

## Heat treatment

| Operation | Temperature |
| --- | --- |
| Austenitising and quenching | 1020 to 1070 C |
| Tempering | 680 to 780 C |

+QT700 comes from the upper tempering range, +QT800 from the lower. Ruling section, quench medium
and tempering temperature together decide the class that can be certified.

## Equivalent grades

| Standard or origin | Designation |
| --- | --- |
| EN 10302, Europe | 1.4935, X20CrMoWV12-1 |
| AISI / UNS, USA | AISI 422, AISI 616, Alloy 616, Grade 616, UNS S42200 |
| JIS G 4311, Japan | SUH616 |
| UNI 7500, Italy | X22CrMoWV12-1 |
| Older and works designations | EW 4935, HWMoV3 |

### Composition comparison, % by mass

| Grade | C | Cr | Mo | Ni | V | W |
| --- | --- | --- | --- | --- | --- | --- |
| EN 1.4935 X20CrMoWV12-1 | 0.17-0.24 | 11.0-12.5 | 0.80-1.20 | 0.30-0.80 | 0.20-0.35 | 0.40-0.60 |
| JIS SUH616 | 0.20-0.25 | 11.0-13.0 | 0.75-1.25 | 0.50-1.00 | 0.20-0.30 | 0.75-1.25 |
| AISI 422, UNS S42200 | 0.20-0.25 | 11.0-12.5 | 0.75-1.25 | 0.50-1.00 | 0.15-0.30 | 0.75-1.25 |

Tungsten is the clearest difference: EN 1.4935 caps it at 0.60 %, SUH616 and AISI 422 allow up to
1.25 %. Treat them as selection equivalents and name one ordering standard on the drawing.

1.4923 is a different grade. 1.4923 is X22CrMoV12-1 with no deliberate tungsten. 1.4935 is
X20CrMoWV12-1 with 0.40 to 0.60 % tungsten. The two numbers are often transposed on drawings.

## Forged product forms in 1.4935

| Family | Items |
| --- | --- |
| Bars | Round bars and rods, square bars, rectangular and flat bars, turbine blade blanks |
| Hollow sections | Hollow bars, sleeves, bushes, bushings, forged pipes and tubes, barrels, casings, shells, cylinders, hubs, housings |
| Rings | Forged rings, seamless rolled rings |
| Solid sections | Blocks, discs, plates |
| Turbine parts | Steam and gas turbine valve spindles, stems and rods |
| Fasteners | Double-headed and double-end studs, bolts, high-temperature fasteners |

All items open-die forged to drawing, quenched and tempered, with EN 10204 3.1 certificate.

## Common questions

**What is steel 1.4935?** The EN material number for X20CrMoWV12-1, a martensitic creep-resisting
chromium steel in EN 10302, used mainly for turbine blades, valve spindles and hot bolting.

**What is 1.4935 equivalent to?** AISI 422 and AISI 616 (UNS S42200), SUH616, and X22CrMoWV12-1 to
UNI 7500. Near-equivalents, not identical grades.

**Maximum service temperature?** About 580 C for creep and 600 C for scaling in continuous service.
Higher figures up to 650 C appear in some supplier literature.

**Is 1.4935 a stainless steel?** On the border. At 11.0 to 12.5 % chromium it can meet the
EN 10088-1 definition, but EN 10302 specifies it for hot strength and oxidation resistance rather
than corrosion resistance.

**Can 1.4935 be welded?** Not easily. Welding group 7.2 of ISO/TR 20172, needing preheat, interpass
control and post-weld heat treatment.

**Which delivery class?** +QT700 for ductility and toughness, +QT800 for strength. Check heavy
sections for through-hardening before specifying +QT800.

## Ordering

Pricing depends on drawing, piece weight, delivery class and test scope, so each enquiry is quoted
individually. Send drawing, quantity, delivery class and test requirements to
sales@steelforgepieces.com or call +86-189-2135-9659.

## Sources

EN 10302:2008 for grade 1.4935, JIS G 4311 for SUH616, UNI 7500 for X22CrMoWV12-1, ISO/TR 20172 for
welding group. Where sources disagree on maximum service temperature, the lower figure is quoted.
For guidance only; it does not replace the standard or the material certificate.