SUS431 Stainless Steel | SUS431 | SS431

Previous 27 / 43 Next

SUS431 Stainless Steel | SUS431 | SS431 Stainless Steel SUS431 Stainless Steel | SUS431 | SS431 Stainless Steel SUS431 Stainless Steel | SUS431 | SS431 Stainless Steel

We are the Leading Supplier of Stainless Steel SUS431.  
Stainless Steel SS431 is a heat treatable martensitic, nickel-bearing grade has the best corrosion resistance properties of all the martensitic grades. 

We supply and export to Singapore , Indonesia , Brunei and other ASEAN Countries.  
Our specialty is to provide wide range of stainless steel
 with no minimum order (MOQ).

E Steel supply Stainless Steel SUS431 (SS431) Round Bars / Rods / Shaft , SUS431 (SS431) Plates. 

SUS431 Stainless Steel has been used in the Palm Oil Industries , E Steel has supply to the Muar Palm Oil Company , and now we are expanding to Sabah and Sarawak with fastest delivery and best matching speficiations & quanlity.  
E Steel supply 16tons of Stainless Steel SS431 Round Bars to Palm Oil Industries in Muar, Malaysia in one month delivery , may read this article :

Stainless Steel SUS431 Suppliers - SUS431 , SS431 , UNS S43100 , DIN 1.4057 Stainless Steel 

SS431 Stainless Steel is a heat treatable martensitic, nickel-bearing grade has the best corrosion resistance properties of all the martensitic grades. It has excellent tensile and torque strength, and good toughness, making it ideally suited to shafting and bolt applications. It can be hardened to approximately 40HRC. Because of its high yield strength, this grade is not readily cold worked and is therefore not recommended for use in operations such as cold heading, bending, deep drawing or spinning.

Martensitic stainless steels are optimised for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually also allow for a final harden and temper heat treatment. Corrosion resistance is lower than the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.

Chemical Formula of Stainless Steel SS431 

Fe, <0.20% C, 15-17% Cr, 1.25-2.50% Ni, <1.00% Mn, <1% Si, <0.040% P, <0.03% S

Mechanical Properties of SUS431 , SS431 

Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (% in 50mm) Hardness Brinell (HB) Impact Charpy V (J)
Annealed * 862 655 20 285 max
204 1345 1055 20 388 50
316 1295 1035 19 375 53
427 1350 1080 19 388 #
538 1140 965 19 321 #
593 1015 770 20 293 64
650 960 695 20 277 84

SS431 is frequently stocked and supplied in “Condition T”, with specified tensile strength of 850 – 1000MPa.

* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum. SS431 is only rarely stocked in annealed Condition A.

# Due to associated low impact resistance this steel should not be tempered in the range 425-600°C

SUS431 Stainless Steel also equivalent to : 

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
SS431 S43100 431S29 57 1.4057 X17CrNi16-2 2321 SUS 431


Alternative Grades for SS431 Stainless Steel 

Grade Why it might be chosen instead of 431
SS410 Only a lower hardened strength is needed.
SS416 High machinability is required, and the lower hardened strength and lower corrosion resistance of 416 is acceptable.
SUS 440C A higher hardened strength or hardness than can be obtained from 420 is needed.

* These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

Corrosion Resistance of Stainless Steel SUS431 

Excellent resistance to a wide variety of corrosive media. Reasonable resistance to salt water in cold southern waters but less resistant than SUS316 in tropical waters. Overall the corrosion resistance of SUS431 is approximately the same as or slightly below that of SUS304.

Performance is best with a smooth surface finish, in the hardened and tempered condition.

Heat Resistance SUS431 

Resists scaling in intermittent service to 925°C and in continuous service to 870°C, but is generally not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties.

Heat Treatment

Full anneal – not practical for this grade – it hardens even when cooled slowly.

Process Anneal – heat to 620-660°C and air cool.

Hardened by heating to 980-1065°C, holding for about 1/2 hour then quenching in air or oil. Pre-heating at 760-790°C may be useful for complex parts or those already hardened. Temper to suit mechanical requirements, at temperatures as indicated in the accompanying table.

The tempering range 425-600°C should be avoided due to reduced impact toughness, although the effect is less marked than in most other martensitic grades.

Applications of Stainless Steel SUS431 

Typical applications include
  • Nuts and bolts
  • Propeller shafting
  • Pump shafts
  • Beater bars
  • Marine hardware
  • Laboratory benches & equipment

Our Sales & Supplier Network

Australia, Pakistan,  Malaysia, Singapore, Taiwan, China,Vietnam, Belgium, Japan, South Korea, Philippines, France, United Kingdom, Indonesia, Thailand, Hong Kong, China, Sweden, United States, Dubai, Finland, Brunei,Germany.

E Steel is a Global Metal Procurement Company in providing and sourcing raw materials to the wide range of engineering industries / sectors.  We works as the the Online B2B Metal Marketplace to help our customers in finding the special steels that might feel hard to source locally.


Please leave your enquiry here, we will reply as soon as possible.
Company Name  
Product Interested  
Contact No.*  
*only support gif, jpeg, jpg, png, pdf

Switch to Mobile Version