Stainless Steel – Grade 310S (UNS S31008)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Hot Working
     Cold Working
     Annealing
     Hardening
Applications

Introduction

Stainless steels are known as high-alloy steels. They are classified into ferritic, austenitic, and martensitic steels based on their crystalline structure.

Grade 310S stainless steel is superior than 304 or 309 stainless steel in most environments, because it has high nickel and chromium content. It has high corrosion resistance and strength in temperatures up to 1149°C (2100°F). The following datasheet gives more details about grade 310S stainless steel.

Chemical Composition

The following table shows the chemical composition of grade 310S stainless steel.

Element Content (%)
Iron, Fe 54
Chromium, Cr 24-26
Nickel, Ni 19-22
Manganese, Mn 2
Silicon, Si 1.50
Carbon, C 0.080
Phosphorous, P 0.045
Sulfur, S 0.030

Physical Properties

The physical properties of grade 310S stainless steel are displayed in the following table.

Properties Metric Imperial
Density 8 g/cm3 0.289 lb/in³
Melting point 1455°C 2650°F

Mechanical Properties

The following table outlines the mechanical properties of grade 310S stainless steel.

Properties Metric Imperial
Tensile strength 515 MPa 74695 psi
Yield strength 205 MPa 29733 psi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation 40% 40%
Reduction of area 50% 50%
Hardness 95 95

Thermal Properties

The thermal properties of grade 310S stainless steel are given in the following table.

Properties Metric Imperial
Thermal conductivity (for stainless 310) 14.2 W/mK 98.5 BTU in/hr ft².°F

Other Designations

Other designations equivalent to grade 310S stainless steel are listed in the following table.

AMS 5521 ASTM A240 ASTM A479 DIN 1.4845
AMS 5572 ASTM A249 ASTM A511 QQ S763
AMS 5577 ASTM A276 ASTM A554 ASME SA240
AMS 5651 ASTM A312 ASTM A580 ASME SA479
ASTM A167 ASTM A314 ASTM A813 SAE 30310S
ASTM A213 ASTM A473 ASTM A814 SAE J405 (30310S)
       

Fabrication and Heat Treatment

Machinability

Grade 310S stainless steel can be machined similar to that of grade 304 stainless steel.

Welding

Grade 310S stainless steel can be welded using fusion or resistance welding techniques. Oxyacetylene welding method is not preferred for welding this alloy.

Hot Working

Grade 310S stainless steel can be hot worked after heating at 1177°C (2150°F). It should not be forged below 982°C (1800°F). It is rapidly cooled to increase the corrosion resistance.

Cold Working

Grade 310S stainless steel can be headed, upset, drawn, and stamped even though it has high work hardening rate. Annealing is performed after cold working in order to reduce internal stress.

Annealing

Grade 310S stainless steel is annealed at 1038-1121°C (1900-2050°F) followed by quenching in water.

Hardening

Grade 310S stainless steel does not react to heat treatment. Strength and hardness of this alloy can be increased by cold working.

Applications

Grade 310S stainless steel is used in the following applications:

  • Boiler baffles
  • Furnace components
  • Oven linings
  • Fire box sheets
  • Other high temperature containers.

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