Stainless Steel 310H Round Bar
➡️ SS 310H | UNS S31009 | EN 1.4845
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
S31009
Wr. No.:
1.4845
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 310H Round Bar
Stainless Steel 310H Round Bar is an austenitic chromium-nickel grade sold as UNS S31009 and W.Nr. 1.4845. The bar standard is ASTM A479 / A479M. Dimensional and surface requirements sit in ASTM A484 / A484M. EN list an equivalent grade. JIS, GB/T and KS do not.
The grade is the controlled-carbon variant of 310, with carbon between 0.04% and 0.10% and a specified coarse grain size, combined with 24-26% chromium and 19-22% nickel. The carbon minimum raises creep-rupture strength for pressure-retaining service above 525 C, while the high chromium and nickel deliver oxidation resistance to approximately 1150 C.
Stock diameters run from 3 mm to 500 mm, with bigger sections forged against order, and lengths are either random 3 to 6 m or cut to a stated size. Bar is supplied in the solution annealed (Condition A, +AT) condition, and can be hot finished, cold drawn, peeled, turned, ground or polished. The grade cannot be hardened by heat treatment; higher strength is obtained only through cold working.
Typical parts are pressure-retaining hot-service components, furnace structural members and machined parts, ordered by the power generation, refining, petrochemical and heat-treatment plant construction industries. Documentation is usually an EN 10204 3.1 certificate listing the heat analysis, the mechanical test results and the condition supplied. Third party inspection, positive material identification and non-destructive examination can be added at order stage. The melting range is roughly 1400 – 1450 C. In the annealed condition the steel is non-magnetic, though cold work can leave it slightly magnetic. Density is around 7.90 g/cm3 and the modulus of elasticity about 200 GPa.
Common Applications of Stainless Steel 310H Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for SS 310H Round Bar
Standard
Country / Region
Grade
ASTM A479 / A479M
USA
Type 310H (UNS S31009)
ASME SA-479
USA
Type 310H (UNS S31009)
EN 10095
Europe / EU
1.4845 (X8CrNi25-21)
BS EN 10095
United Kingdom
1.4845 (X8CrNi25-21)
Technical Specification for Stainless Steel 310H Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
310H / UNS S31009 / W.Nr. 1.4845
-
Product Form
Round Bar / Rod
-
Standard
ASTM A479 / A479M
-
Diameter
3 - 500
mm
Length
3 - 6 (random mill length) or cut to length
m
Manufacturing Process
Hot rolled, forged or cold finished
-
Production Route
EAF + AOD / VOD refining, continuous cast or ingot, hot rolled or forged
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Heat Treatment / Delivery Condition
Solution annealed (condition a, +at)
-
Tolerance Standard
ASTM A484 / A484M
-
Carbon Equivalent (CEV)
Not applicable
-
Density
7.90 (nominal)
g/cm3
Melting Range
1400 - 1450
C
Thermal Conductivity at 100 C
14.2
W/m.K
Coefficient of Thermal Expansion (0-100 C)
15.9
10-6/K
Specific Heat (0-100 C)
500
J/kg.K
Electrical Resistivity at 20 C
0.78
micro-ohm.m
Modulus of Elasticity at 20 C
200
GPa
Magnetic Properties
Non-magnetic in the solution annealed condition, slight magnetism may develop after cold work
-
Applicable Testing / Inspection Standard
ASTM A370 (mechanical testing), ASTM E112 (grain size, where required), ASTM A262 (intergranular corrosion, when specified)
-
Certification / Inspection Documents
EN 10204 3.1 mill test certificate standard, 3.2 third-party, PMI, ultrasonic and dye-penetrant examination available on request
-
Technical Specifications
Get the key technical specifications for Stainless Steel 310H Round Bar
Buyers specify ASTM A479 / A479M for the material and ASTM A484 / A484M for dimensions and surface. In Europe the same steel is called 1.4845 (X8CrNi25-21). The ordered standard and condition should appear on the order and on the certificate.
Solution treatment is performed at approximately 1050-1150 C with rapid cooling, and ASTM A479 requires an austenite grain size of ASTM No. 7 or coarser for the H grade.
Hot finished bar is rolled or forged, then heat treated and pickled. Cold finished bar is drawn, peeled, turned or ground after that. Diameter, out of round, straightness and length tolerances shift with size and finish class, so they are read from the dimensional standard or agreed case by case.
The grade is used where a component must satisfy both ASME elevated-temperature allowable stresses and severe oxidation or carburisation resistance requirements.
The physical properties quoted are typical mill values, not requirements of the standard. Testing is to ASTM A370, with results, analysis, condition and heat number on the certificate. End condition, chamfering, marking and packing are settled at order stage along with the length tolerance.
Chemical Composition for Stainless Steel 310H Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.04
0.10
%
Manganese
Mn
-
2.00
%
Silicon
Si
-
1.50
%
Phosphorus
P
-
0.045
%
Sulfur
S
-
0.030
%
Chromium
Cr
24.00
26.00
%
Nickel
Ni
19.00
22.00
%
Chemical Composition
View the chemical composition and applicable material limits for SS 310H Round Bar
The narrow carbon band is what separates 310H from 310S. Carbon in the 0.04-0.10% range provides the carbide dispersion needed for creep resistance without the weldability penalty of the 0.25% permitted in 310.
Chromium runs 24.00 to 26.00% here, and it is what makes the steel stainless: it builds the passive oxide film that resists attack. Nickel at 19.00 to 22.00% stabilises the structure and improves ductility and toughness. Beyond those, the standard controls only carbon, manganese, silicon, phosphorus, sulfur, chromium and nickel; nothing else is specified. Carbon is held between 0.04 and 0.10%.
The manganese and silicon come from deoxidation and add slight strength. Phosphorus and sulphur are residual elements with low ceilings, because they cost hot workability, weldability and corrosion resistance.
ASTM, EN, JIS, GB/T and KS versions of the grade set slightly different limits. For general work the gap rarely matters; for severe corrosion or hot service it can, so check the heat analysis on the certificate against the standard ordered. Chemical analysis is carried out to ASTM A751. Where the composition table shows no limit for an element, the standard sets no requirement and the element need not be determined or reported.
Mechanical Properties for Stainless Steel 310H Round Bar
Mechanical Property
Value
Unit
Tensile Strength (ASTM A479, annealed)
515 (min)
MPa
Yield Strength 0.2% (ASTM A479, annealed)
205 (min)
MPa
Elongation in 50 mm (ASTM A479, annealed)
30 (min)
%
Reduction of Area (ASTM A479, annealed)
40 (min)
%
Hardness (Brinell)
150 - 190
HBW
Charpy V-Notch Impact at room temperature
60 - 120
J
Modulus of Elasticity
200
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 310H Round Bar
Ambient minima match the other 310 variants; the grade is chosen on the basis of creep-rupture data and ASME allowable stresses in the intended service range.
The figures apply to solution annealed bar and are checked by tensile testing to ASTM A370 at room temperature. Cold finished bar work hardens while it is drawn or ground, so what arrives is often stronger than the minimum and less ductile than it. Toughness holds up to cryogenic temperatures, with no ductile to brittle transition.
For design, use the specified minima of the standard and condition ordered and take the real numbers from the mill certificate. Section size matters too, since diameter affects cooling rate during heat treatment and how much hot or cold work the bar has seen.
In selection terms, moderate strength combined with very high ductility and toughness favours components that must be formed, welded or extensively machined rather than carry high stress in thin sections. Where greater strength is needed at similar corrosion resistance, cold-worked bar, a duplex grade or a precipitation-hardening grade is normally evaluated instead. Machinability is moderate, and work hardening during cutting should be managed with sharp tooling, positive feed and rigid setups.
Dimension / Sizes for Stainless Steel 310H Round Bar
Dimension / Size
Value
Unit
Diameter (standard supply range)
3 - 500
mm
Standard Length
3 - 6
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A484 / A484M, varies with size and finish class
-
Length Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Available Size Range (cold-finished bar)
3 - 100
mm
Available Size Range (hot-finished and forged bar)
16 - 500
mm
Cut-to-Length Availability
Available, tolerance to be agreed at order stage
-
Applicable Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 310H Round Bar
Pricing for Stainless Steel 310H Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Stainless Steel 310H Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What is Stainless Steel 310H Round Bar?
What standard does Stainless Steel 310H Round Bar comply with?
What are the equivalent grades of Stainless Steel 310H Round Bar?
What sizes and lengths are available in Stainless Steel 310H Round Bar?
What are the key mechanical properties of Stainless Steel 310H Round Bar?
What is the typical chemical composition of Stainless Steel 310H Round Bar?
Can Stainless Steel 310H Round Bar be supplied cut to length or with a specific surface finish?
When is 310H specified instead of 310S?
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