Common technical standards for domestic valve materials by solution treatment austenitic - ferritic steel bar or specimen mechanical properties a

Common technical standards for domestic valve materials by solution treatment austenitic - ferritic steel bar or specimen mechanical properties a  

GB / T

20878

In the serial number

Unite

digital

Code

New brand Old brand

Provisions non-proportional extension

Strength R P0.2 b / (N / mm 2 )

Tensile strength R m

/ (N / mm 2 )

Elongation at break A

/%

rate of reduction in area

Z c /%

Impact absorption function A ku2 d

/ J

Hardness b
HBW HRB HV
not less than no greater than
67 S21860 14Cr18Ni11Si4AlTi 1Cr18Ni11Si4AlTi 440 715 25 40 63 - - -
68 S21953 022Cr19Ni5Mo3Si2N 00Cr18Ni5Mo3Si2 390 590 20 40 - 290 30 300
70 S22253 022Cr22Ni5Mo3N   450 620 25 - - 290 - -
71 S22053 022Cr23Ni5Mo3N   450 655 25 - - 290 - -
73 S22553 022Cr25Ni6Mo2N   450 620 20 - - 260 - -
75 S25554 03Cr25Ni6Mo3Cu2N   550 750 25 - - 290 - -

  a Table 7 applies only to rods of diameter, length, thickness or opposite edge distance less than or equal to 75 mm. Steel bars larger than 75 mm may be forged into a 75 mm sample test or negotiated by both supply and demand to provide values ​​that allow the mechanical properties to be reduced.

  b provides non-proportional extension strength and hardness, only when the demand side (specified in the contract) was measured, and the supplier can be based on the size or state of the steel rod or a determination of hardness.

  c flat steel does not apply, but the demand side, both parties determined by the supply and demand.

  d diameter or an opposite side distance of 16mm or less round, hexagonal, octagonal, and the steel edge length equal to or less than 12mm thickness of the steel, flat not impact test.

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