ASTM A240 Type 310H Stainless Steel Sheet & Plate
General Description
As a professional stainless steel supplier, SHH STEEL is pleased to offer ASTM A240 Type 310H Stainless Steel Sheet and Plate. Also known as UNS S31009, this grade is the high-carbon version of Type 310 designed for continuous elevated-temperature applications where enhanced creep resistance is required.
Type 310H contains approximately 25% chromium and 20% nickel, providing outstanding oxidation resistance in continuous service up to about 1100°C. The controlled higher carbon content (0.04–0.10%) combined with a mandatory grain size of ASTM No. 7 or coarser significantly improves long-term creep and rupture strength compared with Type 310S. SHH STEEL supplies ASTM A240 Type 310H in both sheet and plate forms, covering a wide thickness range with full Mill Test Certificates (EN 10204 3.1).
ASTM A240 Type 310H Material Specification
ASTM A240 Type 310H stainless steel sheet and plate are produced in accordance with ASTM A240/A240M and ASME SA-240.
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASTM A240 / ASME SA-240 Type 310H | Full compliance |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.5 mm – 100 mm | Custom sizes available |
| Width / Length | Up to 2500 mm / 12000 mm | Custom fabrication supported |
| Surface Finish | 2B, No.1, BA, HL | Multiple options |
| Heat Treatment Condition | Solution Annealed | Standard supply condition |
| Grain Size Requirement | ASTM No. 7 or coarser | Mandatory for Type 310H |
| Certification | EN 10204 3.1 / 3.2 | Available |
ASTM A240 Type 310H Chemical Composition
| Element | Content (%) | Standard Limit | Role |
|---|---|---|---|
| Carbon (C) | 0.04 – 0.10 | 0.04 – 0.10 | Improves high-temperature creep strength |
| Manganese (Mn) | ≤ 2.00 | 2.00 max | Deoxidation and strength |
| Phosphorus (P) | ≤ 0.045 | 0.045 max | Impurity control |
| Sulfur (S) | ≤ 0.030 | 0.030 max | Cleanliness |
| Silicon (Si) | ≤ 0.75 | 0.75 max | Oxidation resistance |
| Chromium (Cr) | 24.00 – 26.00 | 24.00 – 26.00 | Excellent high-temperature oxidation resistance |
| Nickel (Ni) | 19.00 – 22.00 | 19.00 – 22.00 | Austenite stability and high-temperature strength |
ASTM A240 Type 310H Mechanical Properties
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (30 ksi) | ASTM A370 |
| Elongation in 50 mm | ≥ 40% | ASTM A370 |
| Hardness | ≤ 217 HB / ≤ 95 HRB | ASTM E10/E18 |
| Density | 8.00 g/cm³ | — |
| Grain Size | ASTM No. 7 or coarser | ASTM E112 |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 310H primarily in the solution-annealed and pickled condition. The available surface finishes and typical dimensional capabilities are as follows:
2B Finish (Cold-rolled, annealed, pickled and skin-passed)
- Typical thickness range: 0.5 mm – 6.0 mm (most common 0.8 mm – 3.0 mm)
- Maximum width: up to 1500–2000 mm (depending on thickness)
- Suitable for applications requiring a smooth, bright surface and good flatness.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 100 mm (most common 4.0 mm – 50 mm)
- Maximum width: up to 2000–2500 mm
- Standard finish for heavy plates used in furnace construction and structural high-temperature components.
Other Finishes
- BA (Bright Annealed): Limited thickness range, usually ≤ 3.0 mm
- HL (Hairline) and No.4: Available on request for specific aesthetic or functional requirements
Protective PVC film can be applied on one or both sides. Custom cutting (plasma, laser, or waterjet) and closer dimensional tolerances are available upon request.
Tolerances
Dimensional tolerances follow ASTM A480/A480M.
- Thickness tolerances vary by product form and thickness.
- Width tolerance is typically +6 mm / 0 mm.
- Length tolerance for cut plates is normally +10 mm / 0 mm.
- Improved flatness and tighter tolerances can be provided for precision applications.
- Edge conditions include mill edge, slit edge, sheared edge, or plasma/laser cut edge.
Weldability
ASTM A240 Type 310H can be welded using standard fusion processes such as GTAW (TIG), GMAW (MIG), and SMAW. Due to the higher carbon content, heat input should be controlled. Matching or slightly over-alloyed filler metals (e.g., ER310 or ER310H) are recommended. Preheating is generally not required. Post-weld cleaning and passivation are advised to restore optimum high-temperature performance.
Equivalent Material Grades
| Grade | Standard | Designation / Notes |
|---|---|---|
| Type 310H | ASTM A240 / ASME SA-240 | — |
| UNS S31009 | Unified Numbering System | S31009 |
| 1.4951 | EN 10028-7 / EN 10095 | X6CrNi25-20 |
| Similar Chinese grades | GB/T series | High-carbon 25Cr-20Ni types |
| Reference JIS | JIS | Related high-carbon 310 grades |
Applications
ASTM A240 Type 310H is selected for continuous high-temperature service where improved creep strength is critical. Typical applications are shown below:
| Application Area | Typical Components / |
|---|---|
| Furnace & Heat Treatment Equipment | Radiant tubes, muffles, retorts, furnace parts, heat shields A240 310H |
| Continuous High-Temperature Service | Long-term creep-resistant components, high-temp structural parts |
| Power Generation | Boiler tube supports, combustion chambers, heat recovery systems |
| Chemical & Petrochemical | High-temperature reactors, process heaters, furnace hardware |
| Kiln & Industrial Heating | Kiln components, calciner parts, refractory support systems |
| General Elevated Temperature | Thermowells, anchor bolts, high-temp fixtures |
Why Choose SHH STEEL
SHH STEEL maintains long-term strategic cooperation with major Chinese stainless steel mills and serves as a first-level (primary) agent for these mills. This direct partnership allows us to offer competitive pricing advantages, faster delivery times, and consistent quality assurance.
All ASTM A240 Type 310H material is sourced from reputable Chinese mills under strict quality control, supplied with complete Mill Test Certificates (including grain size results), and supported by our professional export team. Customers benefit from reliable supply, short lead times, and cost-effective solutions for demanding high-temperature applications worldwide.
FAQ
- What is the main difference between 310S and 310H?Type 310H has a higher controlled carbon content (0.04–0.10%) and must meet a grain size requirement of ASTM No. 7 or coarser. These features provide better creep strength for continuous high-temperature service. Type 310S has lower carbon (≤0.08%) and no mandatory grain size requirement.
- What are the equivalent grades of ASTM A240 Type 310H in other countries?USA: UNS S31009 Europe: EN 1.4951 (X6CrNi25-20) China: High-carbon versions of 06Cr25Ni20 / related GB grades Japan: Related high-carbon 310 grades under JIS Other references: Similar designations in DIN and ISO standards for high-temperature 25Cr-20Ni steels
- Why is grain size important for Type 310H?Coarser grain size (ASTM No. 7 or coarser) improves high-temperature creep and rupture strength, which is essential for long-term continuous elevated-temperature applications.
- What is the maximum continuous service temperature for ASTM A240 Type 310H?Approximately 1100°C in continuous service in air, depending on the environment and stress conditions.
- What is the density of ASTM A240 Type 310H?Approximately 8.00 g/cm³.
Conclusion
ASTM A240 Type 310H Stainless Steel Sheet and Plate from SHH STEEL deliver enhanced high-temperature creep strength and outstanding oxidation resistance through controlled higher carbon content and mandatory grain size requirements. Backed by strategic partnerships with Chinese mills, competitive pricing, fast delivery, and reliable quality, we provide trusted solutions for continuous elevated-temperature applications worldwide.
Contact SHH STEEL today for your ASTM A240 Type 310H requirements.
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