Dual grades and multi grades of material marking

Multi grades

Marking of pipe product means that the product is complied with more specifications.

Marking: ASTM A106 Gr. B / ASTM A53 / API 5L Gr. X52 PSL1.

So, the marking products are complied ASTM A106 Gr. B, A53 and API 5L Grade X52 PSL 1.

Dual grades

Marking of pipe product mean that product also complied with one more grade.

ASTM A312 TP316/316L

Means carbon content < 0.035% expressed type 316L and min. tensile strength 205 MPa expressed type 316.

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How is EU and American standard dual marking?

Yes, specify in each standard. You may look at the marking, packaging and lable section of each standards.

Its stencle of pipe ACC/REJ?

SMB PIPE DN150 API 5L/ASTM A106-B ERW 25781987

Mr. @bien,
your option of rejection or acceptance

@JANSI, @BINH_VT

ASTM A106 specification doest not cover the welded pipe. This marking was rejected.

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Bien was correct , A106 refers to Seamless pipes only.
So you can reject

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