A387 Grade 12 Class 2

A387 Grade 12 Chrome Moly Steel is used for boilers and pressure vessels in hot places

A387 Grade 12 Chrome Moly Steel is used for boilers and pressure vessels in hot places

A387 Grade 12 Chrome Moly steel is a boiler plate steel according to the ASTM/ASME Standard A387/A387M. A387  Grade 12 is designed for use in pressure vessels and heat exchangers where there is an elevated temperature. It is described as an alloyed high temperature pressure vessel steel.

The addition of chrome and molybdenum in the steel making makes this plates suitable for use at high temperatures whilst also giving them some corrosion resistant properties. Whilst not as corrosion resistant as stainless steels, chrome moly plates in the A387 family are often a cost effective substitute in lower risk areas.

A387 Grade 12 Class 2 Ex-stock

Commonly written as A387 12 we offer A287 Grade 12 is a variety of thickness from 6 – 60mm and in a full range of plates dimensions with the most popular plate sizes being 2 x 12m and 3 x 12m. A387 Grade 12 plates are normally from German mills – typically Salzgitter and come with an En10204 3.1 MTC.

  • Thickness: 6 – 60 mm
  • Width: Up to 3 metres
  • Length: Up to 12 metres
  • MTC: Normally EN 10204 3.1 but 3.2 also possible

We only offer A387 G2 12 to Class 2 as these have improved physical properties over A387 Grade 12 class 1 plates. Normally this is satisfactory for engineering and customers but always do check with them first before placing an order.

A387 Grade 12 Class 2 Equivalents

Normal equivalents for A387 Gr 12 Cl2 are:

  • BS1501 620 B
  • EN10028-2 13CrMo4-5
  • DIN 17155  13CrMo4-4

A387 Grade 12 Certification

Pates are normally certified for ASME SA387 Gr 12 Cl2 as the ASME standard is harmonised with the ASTM A387 standard. This A387 and SA387 are interchangeable.

We also offer A387 Grade 5, A387 Grade 11 and A387 Grade 22 as well as 16Mo3 ex-stock

European customers can purchase  ASTM A387 Gr 12 from AncoferWaldram or order new rolling directly from Dillinger Hutte. You can purchase a copy of ASTM A387A387M-11 from the BSI website

ASTM A387 Grade 12 Pressure Vessel Steel Chemical Composition

Steel GradeCC (Min)SiSi (Min)MnMn (Min)PSCrCr (Min)MoMo (Min)
A387 12 CL20.170.040.450.130.730.350.0350.0351.210.740.650.4
This table provides the main features of the chemical composition of A387 Grade 12 boiler plate steel as required by ASTM/ASME A387. It is not complete as we have not included many of the minor use cases. These may have a major impact in your application so please use this for reference purposes only and refer to your original and up to date copy of the relevant standard