What temperature is SA 387 GR 11 hot rolled steel plate?

SA 387 Grade 11 (also known as 1.25Cr-0.5Mo alloy steel) is a chromium-molybdenum low-alloy steel plate specified by ASTM/ASME for high-temperature pressure vessel applications, including boilers, heat exchangers, and petrochemical reactors. Its temperature performance is defined by both service temperature limits and heat treatment requirements, with minor variations between Class 1 and Class 2.

SA 387 Gr 11 contains approximately 1.25% Chromium and 0.5% Molybdenum, which provides:

Excellent creep resistance

Good high-temperature strength

Improved oxidation resistance

Stability under long-term thermal exposure

Because of these properties, it is widely used in refineries, petrochemical plants, hydrogen service, and power generation equipment.

Under ASME Section II, Part D, the maximum allowable design temperature for SA 387 Grade 11 is typically around:

540°C (1000°F) for long-term service

⚠️ The exact allowable stress at a given temperature must always be checked against the latest ASME code tables, as allowable stresses decrease as temperature increases.

Standard SA 387 Gr 11 is not intended for very low-temperature service

Impact testing may be required for temperatures below –20°C

For sub-zero or cryogenic service, other alloy steels are more appropriate

SA 387 Grade 11 plates undergo specific heat treatment to achieve their high-temperature properties:

lass Distinction: Class 1 uses normalizing + tempering, while Class 2 uses quenching + tempering (Q&T) to achieve higher yield strength (310 MPa vs. 240 MPa for Class 1).

The chemical composition of AISI A387 grade 11-PVQ alloy steel is outlined in the following table.

The following table shows the physical properties of AISI A387 grade 11-PVQ alloy steel.

The mechanical properties of AISI A387 grade 11-PVQ alloy steel are displayed in the following table.

At GNEE, we supply ASTM/ASME-certified SA 387 Grade 11 Class 1 and Class 2 plates optimized for:

Heavy-duty tube shell heat exchangers operating at 550–593°C

Petrochemical reactors with cyclic temperature variations

Power generation boilers handling superheated steam

Our plates undergo rigorous NDT (ultrasonic inspection) and meet heat treatment specifications to ensure consistent temperature performance across all thicknesses (6mm–200mm).

SA 387 Grade 11 temperature capability at a glance:

✅ Recommended service temperature: up to 540°C (1000°F)

✅ Ideal for elevated-temperature pressure vessels

✅ Excellent balance of strength, creep resistance, and weldability

Request A Quote

If you need help selecting SA 387 Grade 11 Class 1 or Class 2 for your specific operating temperature and pressure, GNEE Steel can provide professional technical support and fast quotations.

What is SA 387 Grade 11 Class 2 equivalent to?

Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.

What is SA 387 GR 12 material?
chrome molybdenum carbon alloy steel
SA387 GR 12 CLASS 2

Engineered for use in elevated temperature service, ASME SA387 Grade 12 is a chrome molybdenum carbon alloy steel for use in weldable pressure vessels and industrial boilers.

What is the difference between SA 387 Grade 11 CL 1 and Class 2?
The difference between SA 387 Grade 11 Class 1 and Class 2 Plate lies in their mechanical properties. However, they both have the same chemical composition. The tensile strength and yield strength of class 2 material is higher than that of class 1, whereas the elongation for class 1 is higher compared to class 2.

What is the difference between SA 516 GR 70 and SA 387 GR 11?

Compared to carbon steel plates, SA 387 Gr 11 plates offer superior corrosion and oxidation resistance while maintaining good tensile and yield strength. Compared to SA 516 Gr 70 plates, SA 387 Gr 11 plates have better resistance to oxidation and corrosion, making them a better choice for high-temperature environments.

GNEE Steel also supplies a variety of boilers and pressure vessel steel plates, such as A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.