310S (S31008) | BYBOLT

Grade: 310S

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Each grade retains its own composition, condition and specification requirements.

What is 310S stainless steel and its applications?

310S stainless steel (UNS S31008) is a lower-carbon member of the heat-resistant 310 family. It is used in furnace fabrications and thermal equipment, particularly where fabrication requirements must be balanced against hot-service performance.

Furnace fabrications: Linings, supports and related components.
Thermal-processing equipment: Fixtures and baskets selected for the heating atmosphere.
Hot-gas systems: Burner and duct components with defined thermal cycles.

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Choose your 310S product

Engineering Application & Selection Guide

310S retains the high chromium and nickel levels of the 310 family while restricting carbon. Lower carbon does not make it interchangeable with the controlled-carbon 310H grade for creep-dependent service.

310S hex bolts — For removable hot covers, include tightening temperature and shutdown conditions in the connection review.
310S stud bolts — For a joint carrying load throughout a furnace cycle, assess time at temperature and retained clamp load.
310S flat washers — Define the bearing area, mating surface and thermal movement; do not assign a spring function to a plain washer.

Use the 310 grade-selection guide to check the requested suffix and certification. Where an oxidation-resistant fabrication needs high-strength bolting, the best fastener material may differ from the sheet or plate grade.

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310S Composition

Composition limits · wt.%

ElementWeight %

Cr: 24–26%
Ni: 19–22%
C: ≤0.08%
Mn: ≤2.0%
Si: ≤1.50%
P: ≤0.045%
S: ≤0.030%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

310S hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Stainless steel bar reference · Catalogue cites a historical edition; specify the applicable revision.	GB/T 1220
Seamless boiler, superheater & heat-exchanger tube	ASTM A213 / ASME SA213 TP310S
Plate, sheet & strip	ASTM A240 / ASME SA240

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

How to specify round bar, plate, wire and strip ↗

310S Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Test temperature: Room temperature
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥515 MPa
0.2% yield strength	≥205 MPa
Elongation	≥30%

Supplied technical reference · Scanned PDF page 18 · printed page 30

310S Physical Properties

Property	Value	Unit
Density	7.98	g/cm³
Melting range	1395–1435	°C

Procurement and application guide

Specify the material and final condition

State the atmosphere and load; oxidation resistance is not an allowable stress.

Material forms in the technical reference: Bar · Forged bar · Wire · Plate · Sheet · Strip · Pipe & tube.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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