ASME SA240 310H Stainless Steel Plate | SA240 Type 310H

As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 310H Stainless Steel Plate, also known as SA240 Type 310H.

ASME SA240 Type 310H is the higher-carbon version of the high-chromium, high-nickel austenitic stainless steel Type 310. While Type 310S is limited to a maximum of 0.08% carbon, Type 310H is deliberately specified with a carbon range of 0.04–0.10%. This controlled higher carbon content provides significantly improved strength at elevated temperatures, particularly above 500°C, while the very high chromium (24–26%) and nickel (19–22%) contents continue to deliver outstanding resistance to high-temperature oxidation.

Type 310H is selected for the most severe continuous high-temperature service in oxidizing atmospheres, including furnace components, radiant tubes, heat-treatment fixtures, kiln parts, and high-temperature pressure vessels that require both maximum oxidation resistance and higher allowable stresses. It represents the top-performing standard austenitic grade for combined high-temperature strength and scaling resistance.

SHH STEEL supplies ASME SA240 310H as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, full heat traceability, and shorter lead times. We offer a practical dimensional range and a full selection of surface finishes to meet project requirements.

Heat Analysis (Ladle Analysis) according to ASME SA240 Type 310H:

Product Analysis (typical permissible variations):

The controlled carbon range of 0.04–0.10% provides solid-solution strengthening and improved creep strength at elevated temperatures, while the very high chromium and nickel contents maintain outstanding oxidation resistance up to approximately 1100°C.

Room-Temperature Mechanical Properties (Annealed Condition)

Elevated-Temperature Performance ASME SA240 310H is specifically intended for the most demanding elevated-temperature service. The higher carbon content delivers better tensile and yield strength above approximately 500°C and improved long-term creep strength compared with Type 310S, while retaining outstanding oxidation resistance in continuous service up to approximately 1100°C in oxidizing atmospheres.

Physical Properties

• Density: approximately 7.90 g/cm³
• Melting Range: approximately 1400–1450°C
• Magnetic: Non-magnetic in the annealed condition

When both maximum oxidation resistance and higher allowable stresses at elevated temperature are required, ASME SA240 310H is the preferred standard austenitic grade. For applications where the highest strength is not critical, astm a240 type 310s stainless steel sheet plate offers similar oxidation resistance with better weldability. Related lower-alloy options include astm a240 type 309h stainless steel sheet plate and astm a240 type 304h stainless steel sheet plate.

High-Temperature Performance and Sensitization

The higher carbon content that gives Type 310H its elevated-temperature strength also increases its susceptibility to sensitization compared with 310S. Prolonged exposure in the temperature range of approximately 450–850°C can lead to chromium carbide precipitation at grain boundaries. In continuous high-temperature oxidizing service this is usually acceptable. However, if the equipment will encounter corrosive media during shutdowns or in process streams, additional precautions should be considered.

In the annealed condition, ASME SA240 Type 310H offers good general corrosion resistance in many atmospheric and mild chemical environments. Its primary strength lies in outstanding high-temperature oxidation resistance rather than aqueous corrosion performance.

It resists oxidation and scaling exceptionally well in continuous service up to approximately 1100°C in air or oxidizing atmospheres. Resistance to sulfidation and carburization is moderate to good. In aqueous chloride environments its pitting resistance is lower than molybdenum-bearing grades.

ASME SA240 Type 310H can be welded by all standard fusion and resistance welding methods. When high-temperature strength of the weld metal is required, matching high-carbon filler metals (E310H / ER310H) are recommended. Standard E310 / ER310 or E310L fillers may be used when corrosion resistance of the weld is the higher priority.

Due to the higher carbon content, the heat-affected zone is more prone to sensitization than in 310S. For critical corrosive service after welding, post-weld solution annealing may be advisable.

ASME SA240 Type 310H is supplied in the solution-annealed condition. Proper heat treatment is essential to achieve optimum properties.

Recommended Solution Annealing Parameters

• Temperature range: 1040 – 1150°C (typically 1050 – 1120°C)
• Holding (soaking) time: – Plates ≤ 25 mm thick: minimum 10–20 minutes after the entire cross-section has reached the target temperature – Plates 25–50 mm thick: minimum 20–40 minutes – Plates above 50 mm: 30–60 minutes or longer, depending on thickness and furnace loading, to ensure uniform temperature
• Cooling: Rapid cooling is mandatory. Water quenching is strongly preferred for thicker plates to avoid re-precipitation of carbides and to restore maximum corrosion resistance and ductility.

Proper solution annealing dissolves chromium carbides and returns the material to its optimum condition for high-temperature service.

SHH STEEL regularly supplies ASME SA240 310H in No.1 finish for high-temperature applications and can provide other finishes according to project requirements.

Dimensional tolerances for ASME SA240 310H Stainless Steel Plate conform to ASME SA240 and the general requirements of ASTM A480.

Typical available size range for SA240 310H plate:

• Thickness: 3 mm – 80 mm (thicker plates available on request)
• Width: up to 2000–3000 mm
• Length: up to 12000 mm or cut-to-length according to customer requirements

Thickness, width, length and flatness tolerances are controlled within standard limits. Tighter tolerances for SA240 310H plate can be arranged for specific project needs. SHH STEEL provides precise dimensional control for both standard and custom-size SA240 310H plates.

Related grades frequently evaluated with ASME SA240 310H include astm a240 type 310s stainless steel sheet plate, astm a240 type 309h stainless steel sheet plate, astm a240 type 309s stainless steel sheet plate, and astm a240 type 304h stainless steel sheet plate.

ASME SA240 Type 310H is selected for the most severe continuous high-temperature oxidizing service that also requires higher strength. Typical applications of SA240 310H include:

Because of its superior combination of oxidation resistance and elevated-temperature strength, SA240 310H is often specified when service conditions exceed the practical limits of 310S or 309H.

SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term strategic cooperation with major Chinese stainless steel mills and supply ASME SA240 Type 310H with the following advantages:

• Competitive mill-direct pricing
• Consistent quality and complete heat traceability
• Full Mill Test Certificates (EN 10204 3.1 / ASME)
• Flexible dimensions and surface finishes (including SA240 310H No.1 and SA240 310H 2B)
• Technical support for high-temperature material selection
• Reliable worldwide logistics and export documentation