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Quick Details

  • Standard: ASTM, AISI, DIN, EN, GB, JIS
  • Dimensions: Dia 3.0 - Dia 250mm
  • Grade: 400 Series
  • Place of Origin: Jiangsu, China (Mainland)
  • Brand Name: Changjiang
  • Model Number: AISI 431
  • Type: Round
  • Application: Pump and propeller shafts, bolts and nuts etc.
  • Shape: Round
  • Certification: SGS
  • Surface: Black or machined

Packaging & Delivery

Packaging Details Seaworthy packing.
Delivery Time Within 45 working days after receipt 30% of value.

Martensitic stainless steel round bar AISI 431


Grade 431 stainless steels are martensitic, heat-treatable grades with excellent corrosion resistance,

torque strength, high toughness and tensile properties.

All these properties make them ideal for bolt and shaft applications.

These steels, however, cannot be cold-worked owing to their high yield strength, hence they are suitable for

operations such as spinning, deep drawing, bending or cold heading.

Fabrication of martensitic steels is generally carried out using techniques that allow hardening and tempering

treatments and poor weldability.

The corrosion resistance properties of grade 431 steels are lower than that of austenitic grades.

The operations of grade 431 are limited by their loss of strength at high temperatures, due to over-tempering,

and loss of ductility at negative temperatures.


Chemical composition ( by weight % )

4310.12 ~ 0.221.00 max1.50 max0.040 max0.030 max15.00 - 17.001.50 - 2.50 


Heat treatment

Full anneal — Full annealing cannot be performed on grade 431 steels.

This grade gets hardened even during slow cooling.


Process anneal — Grade 431 steels are heated to 620 to 660°c and then air-cooled.


Grade 431 steels are generally hardened by heating at temperatures from 980 to 1065°c, holding for nearly ½ h,

followed by oil or air quenching. Complex or hardened parts of grade 431 steels can be pre-heated to temperatures from

760 to 790°c and tempered, to improve their mechanical properties. Tempering of these steels at 425 to 600°c should

be avoided, owing to the loss of impact toughness at this temperature range. 



Typical applications of grade 431 stainless steels include the following:

* Pump and propeller shafts

* bolts and nues

* beater parts

* marine systems

* laboratory equipments


Contact PAul, export @ ahoneststeel.com, skype: paul_luhongxiang, whatsapp: 0086 15190257143

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