What is ASTM A387 Grade 11 equivalent to?

ASTM A387 grade 11 steel is pressure vessel grade steel for use in elevated temperature service. ASTM A387 grade 11 steel is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures.

What is ASTM A387 grade 11 equivalent steel?

ASTM A387 grade 11 equivalent steel is ASME SA387 grade 11. ASTM A387 grade 11 covers A387 grade 11 class 1 and A387 grade 11 class 2, which are equivalent to ASME SA387 grade 11 class 1 and SA387 grade 11 class 2 respectively.

ASTM A387 grade 11 equivalent steel has similiar properties and performance to A387 grade 11 steel. The higher level of chromium provides excellent corrosion and oxidation resistance to A387 grade 11 and ASTM A387 grade 11 equivalent steel ASME SA387 grade 11, which is a must in sour gas applications.

The Cr-Mo alloy system is the core reason for its heat resistance and long-term stability in pressure vessel applications.

Below is a clear comparison of ASTM A387 Grade 11 equivalents in major international standards:

🔹 EN (European Standard)

EN 10028-2 13CrMo4-5 (1.7335)
✅ Most common and closest equivalent
Used extensively in European pressure vessel manufacturing.

🔹 DIN Standard

DIN 13CrMo4-5
Equivalent to EN 1.7335, commonly found in older DIN-based projects.

🔹 BS (British Standard)

BS 1501-621-440B
Historically used in boilers and pressure vessels.

🔹 JIS (Japanese Standard)

JIS G3118 SCMV2
Used for pressure vessels and high-temperature equipment in Japan.

🔹 GB (China Standard)

GB 713 12Cr1MoVR
Widely applied in Chinese pressure vessel manufacturing.

Pressure vessel shells and heads

Shell & tube heat exchangers

Reactors and separators

Boilers and steam drums

Hydrogenation equipment

Refinery and petrochemical process units

Its performance under high temperature and high pressure makes it ideal for ASME-coded vessels.

As an experienced pressure vessel steel plate supplier, GNEE Steel offers:

✅ ASTM A387 Grade 11 / EN 13CrMo4-5 / 12Cr1MoVR plates

✅ Thickness range: 6mm – 150mm

✅ Normalized & Tempered (N+T) condition

✅ EN 10204 3.1 / 3.2 mill test certificates

✅ UT testing, PWHT simulation, cutting & machining

✅ Global export experience since 2008

We also provide material substitution guidance, helping EPC contractors and manufacturers select the most cost-effective equivalent material without compromising safety or compliance.

If you are looking for ASTM A387 Grade 11 equivalents, competitive pricing, or professional technical support, GNEE Steel is ready to assist.

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Can EN 13CrMo4-5 replace ASTM A387 Grade 11 directly?
Yes, in most pressure vessel projects, EN 13CrMo4-5 is accepted as a direct equivalent, pending design code approval.

Is ASTM A387 Grade 11 suitable for hydrogen service?
Yes, it performs well in hydrogen environments, especially after proper heat treatment.

Does GNEE Steel support customized sizes?
Absolutely. We offer customized pressure vessel steel plates with cutting, beveling, and inspection services.

What is A387 grade 11 material?

The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service. SSAB can supply A387 Grade 11 to the tension test requirements for Class 1 and/or Class 2.

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 chemical composition of ASTM A387 Grade 11 Class 2?

ASTM A387 GR 11 CL 2 Plates is designed with the composition of chemicals such as carbon, silicon, phosphorous, chromium, sulfur, molybdenum, and manganese.

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.