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PRODUCT DATA SHEET

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431 STAINLESS STEEL

Hardenable Martensitic Stainless Steel Alloy

Type 431 is a hardenable martensitic stainless steel alloy which has a combination of high tensile and torsional strength – this makes it well suited to shaft manufacture.
The alloy is intended for use in applications requiring good strength and toughness combined with reasonable corrosion resistance. As the alloy offers considerable resistance to saltwater corrosion, it is used widely in marine equipment and systems.

Type 431 is easily machined in the annealed state but welding is difficult due to cracking and it is recommended that the material is preheated to improve welding performance.

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TYPICAL APPLICATIONS
• Marine systems
• Pump & propeller shafts
• Outboard motor drive shafts
• Valve stems
• Aircraft components
• Axles
KEY FEATURES

• Heat treatable martensitic stainless steel
• High tensile and torsional strength and is well suited to shaft  manufacture.
• Welding is poor and cannot be easily cold worked

MACHINABILITY
Risk of cracking. Pre-heating recommended.
WELDABILITY

Risk of cracking. Pre-heating recommended.

AVAILABILITY
Round bar, plate, sheet and tube
CORROSION RESISTANCE

Similar to Type 304 stainless steel. Considerable resistance
to saltwater and therefore useful in marine applications.

RELATED SPECIFICATIONS

BS 970 431S29T 1.4057 X17CrNi16-2
X16CrNi16 AISI ASTM UNS S43100

TYPICAL CHEMICAL COMPOSITION
PREn = Pitting Resistance Equivalent

PREn= Cr% + 3.3Mo% + 16N%

Carbon 0.02% Max
Silicon 0.80% Max
Manganese 1.00% Max
Phosphorous 0.030% Max
Sulphur 0.010% Max
Chromium 19.5 – 20.5%
Nickel 17.5 – 18.5%
Molybdenum 6.0 – 6.5%
Nitrogen 0.18 – 0.22%
Copper 0.50 – 1.00%
PREn >40
MECHANICAL PROPERTY REQUIREMENTS – ANNEALED CONDITION
Yield Tensile Strength Elongation Charpy Impact @ Rt J Hardness
>300Mpa (44KSI) 650 – 850Mpa
(94 – 123KSI)
35% 100 260HB Max
PHYSICAL PROPERTIES
Density Modulus of Elasticity Electrical Resistivity Thermal Conductivity at 100°C
7800 kg/m3 200GPa 720 n. Ω.m 20.2 W/m.K

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