34CrMo4 Seamless Steel Pipe

34CrMo4 seamless steel pipe

Applicable Standards of 34CrMo4 seamless steel pipe

--- EN 10083-1 steel for quenching and tempering generaltchnical delivery conditions

--- ASTM A370 standard test methods and definitions for mechanical testing of steel products

--- JIS G3429 seamless steel tubes for high pressure gas cylinders.

--- ASTM E112 standard test methods for determining average grain size

--- ASTM E45 standard test methods for determining the inclusion content of steel

Test and inspection of 34CrMo4 seamless steel pipe

Chemical composition (Ladle and product analysis)

Tensile test (on heat treated samples)

Impact test (on heat treated samples)

Flattening test (on heat treated samples)

Bending test (on heat treated samples)

Hardness test (on heat treated samples)

Electromagnetic inspection

Ultrasonic inspection result

Grain size

Inclusion rating

Gas content

Tramo elements content

Sulphide stress cracking test result

Marking of 34CrMo4 seamless steel pipe

After all test and inspection, the following information shall be legibly marked on the external surface and starting on the one end of all the pipes.

Heat number

Size (OD-Outer diameter, WT-Wall thickness & Length)

Manufacturer's brand or name

Production date

Steel grade

Country of origin

Application of 34CrMo4 seamless steel pipe

The seamless steel pipes shall be used for the manufacturing of refillable seamless steel gas cylinders with tensile strength less than 1100MPA. Since the gas cylinders are manufactured by hot spinning process the steel grade used shall be compatible for the manufacturing of high pressure gas cylinders.

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