310H Stainless Steel | UNS S31009

Grade: Stainless Steel 310H

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

What is 310H stainless steel and its applications?

310H stainless steel (UNS S31009) is a controlled-carbon austenitic grade specified for elevated-temperature strength. It belongs to the 310 heat-resistant family, but its H designation carries requirements that should remain explicit on a purchase order.

Hot process equipment: Components whose design depends on elevated-temperature properties.
Furnace supports: Loaded parts subject to prolonged heat exposure.
Thermal plant connections: Hardware requiring a defined creep-design basis.

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Choose your Stainless Steel 310H product

Engineering Application & Selection Guide

Controlled carbon supports the high-temperature properties sought from the H grade. The applicable product specification and processing requirements matter as much as the nominal chromium-nickel chemistry.

310H stud bolts — State service duration and temperature so the required creep and relaxation basis can be reviewed.
310H hex bolts — For heated supports, include the bearing material and differential thermal movement in the joint calculation.
310H custom fasteners — Define the complete manufacturing sequence and acceptance tests when machining a threaded part from certified stock.

310S cannot be assumed to satisfy 310H. Before replacing either with Incoloy 800H, compare the governing design requirements and available condition-specific data. Room-temperature tensile strength alone cannot resolve the substitution.

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Stainless Steel 310H Composition

310H flat-product composition limits · wt.%

ElementWeight %

Cr: 24–26%
Ni: 19–22%
C: 0.04–0.10%
Mn: ≤2.00%
Si: ≤0.75%
P: ≤0.045%
S: ≤0.030%
Fe: Balance

ASTM / ASME specifications by product form

Finished-product requirements

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

Stainless Steel 310H 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
310H plate, sheet & strip · Specify S31009 and applicable edition.	ASTM A240/A240M / ASME SA-240/SA-240M

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 ↗

Procurement and application guide

Specify the material and final condition

Specify 310H / S31009, product form and condition. Confirm creep design requirements and service atmosphere.

Material forms in the technical reference: Plate · Sheet · Strip.

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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