AISI 422 Stainless Steel Plate | UNS S42200 | 12Cr-Mo-W-V Plate | UNS S42200 | 12Cr-Mo-W-V

As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 422 Stainless Steel Plate.

AISI 422 is widely known and searched under many different names and designations, including AISI 422, UNS S42200, Type 422, 422 stainless steel, 422 stainless steel plate, ASTM A565 Grade 616, 12Cr-Mo-W-V and high-temperature martensitic 422. All these names refer to the same modified 12% chromium martensitic steel alloyed with molybdenum, tungsten, vanadium and a small nickel addition.

AISI 422 is not a simple high-carbon 410 or 420. The Mo-W-V combination provides high tempered hardness and useful creep strength in steam-turbine temperature ranges. The grade remains magnetic and is supplied annealed or heat treated according to the specification.

Typical uses include steam-turbine blades, high-temperature fasteners, discs, valve parts and other components that must keep strength after long exposure to elevated temperature. Corrosion resistance is in the 12% Cr family, similar to A240 410, not to austenitic 304/310.

SHH STEEL supplies AISI 422 as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery.

AISI 422 is frequently compared with A240 410, A240 410S, A240 430, a240 310s, a240 309s and a240 304. SHH STEEL provides technical support to help customers choose the most appropriate grade.

SHH STEEL can supply AISI 422 dual-certified to the required ASTM designation when specified by the project.

Typical Chemical Composition of AISI 422 (UNS S42200):

The defining features of AISI 422 are carbon around 0.20–0.25% plus Mo, W and V in a 12% Cr martensitic base. These alloying elements give secondary hardening and better strength retention at steam-turbine temperatures than plain 410 or 420. Residuals are kept low for high-integrity rotating parts. SHH STEEL carefully controls this multi-alloy chemistry

Typical Heat-Treated / Specified Values

AISI 422 is usually specified in a quenched-and-tempered condition for turbine and high-temperature fastener service. Annealed plate can be supplied for subsequent machining and heat treatment. SHH STEEL supplies the mechanical condition named on the purchase order.

Physical Properties
Density is approximately 7.75–7.80 g/cm³. The grade is magnetic in all common heat-treated conditions. Useful high-temperature strength is typically in the steam-turbine range around 540–650°C, depending on design stress and time.

AISI 422 is selected when 12% Cr corrosion resistance must be combined with high tempered strength at elevated temperature. It is not a substitute for a240 310s in severe oxidizing furnace service, and it is not a substitute for A240 410S in heavily welded constructions.

AISI 422 offers moderate corrosion resistance similar to other 12% chromium martensitic steels. Best performance is obtained after heat treatment with a clean, passive surface.

It resists steam, mild atmospheres and many power-generation environments. It is not equivalent to a240 304 or a240 316l in chloride service. For high-temperature oxidation rather than high-temperature strength, SHH STEEL compares a240 309s and a240 310s.

AISI 422 has limited weldability because of its carbon content and hardenable martensitic structure. Preheat and post-weld heat treatment are normally required.

Matching or approved martensitic fillers are selected according to the turbine or fastener specification. If extensive welding of soft plate is required, SHH STEEL recommends A240 410S.

AISI 422 is a quench-and-temper grade.

Typical hardening is performed from about 1025–1050°C, followed by oil or air cooling and double tempering to develop secondary hardening from Mo, W and V. Final hardness and toughness depend on the specified tempering practice. SHH STEEL can supply annealed plate for later heat treatment or QT material when the drawing requires it.

SHH STEEL supplies AISI 422 in the finish required by the machining or turbine specification.

Dimensional tolerances for AISI 422 plate supplied by SHH STEEL generally conform to ASTM A480 practices.

Typical available size range is thickness 1 mm – 80 mm, width up to 1500–2000 mm, and length up to 6000–12000 mm or cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.

Related grades for comparison include A240 410, A240 410S, A240 430, a240 309s, a240 310s and a240 304.

AISI 422 is selected for high-strength 12% Cr parts that operate at elevated temperature. Typical applications of AISI 422 include:

SHH STEEL supplies AISI 422 for these high-temperature strength applications with consistent quality. For related industry solutions, see our energy industry, petrochemical industry and equipment manufacturing pages. Supporting services include steel cutting services, cnc steel machining services and worldwide shipping service.

SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and high-temperature grades. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 422 with the following advantages:

• Genuine China steel mill-Direct Supply pricing
• Consistent quality and complete heat traceability
• Full Mill Test Certificates (EN 10204 3.1)
• Mo-W-V AISI 422 material optimized for steam-turbine strength
• Flexible dimensions and finishes (including AISI 422 No.1 and AISI 422 ground)
• Technical support for selection among AISI 410, 420, 422 and 310S
• Value-added services including steel cutting services, cnc steel machining services and worldwide shipping service

For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.

es, SHH STEEL commonly supplies dual-certified material upon request.