A387 Gr12 vs EN 13CrMo4-5 (1.7335): Euro vs US Steel Selection Tips

A387 Grade 12 (ASTM standard, US) and EN 13CrMo4-5 (UNS G41350, Werkstoffnr. 1.7335, European) are widely used chromium-molybdenum (Cr-Mo) low-alloy steels for high-temperature, pressure-bearing equipment like heat exchangers, boilers, and petrochemical reactors. While both excel in moderate-to-high temperature service, their differing chemical compositions, performance thresholds, and standard compliance make them suited for distinct regional projects and operating conditions. Below is a technical comparison and practical selection framework for industrial applications.

✔ LNG-related pressure equipment → A387 Gr.12
✔ European refinery revamp → 13CrMo4-5
✔ Hydrogen reformer vessels → Depends on code authority
✔ Global skid-mounted equipment → A387 Gr.12 preferred

GNEE Steel supplies both:

ASTM A387 Gr.12

EN 13CrMo4-5 (1.7335)

With:

Full MTC (EN 10204 3.1)

UT, impact, and PMI testing

N / N+T delivery

OEM cutting & heat treatment

Export experience across EU, Middle East, Southeast Asia

We help clients avoid costly rejections caused by wrong material selection.

There is no "better" steel-only the right steel for the right code.

Choose A387 Gr.12 for ASME-driven, global projects

Choose EN 13CrMo4-5 for EU-regulated installations

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What is A387 gr 12 material?

A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics. The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.

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 equivalent to 13CrMo4-5?

Equivalent grades of 13CrMo4-5, 13CrMo4-4, 1.7335, F11
05, 15 CD 4.05, BS 620, BS 621, KL 9, Cr5Mo45.

What is the heat treatment of 13CrMo4-5?

After welding the, 13crmo4-5 post weld heat treatment follows these steps. Soft annealing these modules at room temperature between 600 to 700 degrees C. Normalizing in temperatures of 910 to 940 degrees C with air. Air cooling at temperatures of 660 to 710 degrees C for relief annealing.

What is 13CrMo4-5?

In summary, 13CrMo4-5 is a high-performance, low-alloy chromium-molybdenum steel, suitable for use in high-temperature applications requiring high resistance to corrosion and oxidation.