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GB/T 11251 30CrMnSiA alloy steel plates steel plate

GB/T 11251 30CrMnSiA alloy steel plates are medium carbon tempered steel with high strength and poor welding performance. After quenching and tempering, 30CrMnSiA alloy steel plates have high strength and toughness and good hardenability.

GB/T 11251 30CrMnSiA alloy steel plates chemical composition:

Grade

C

Si

Mn

Cr

Mo

Ni

W

B

Al

Ti

V

30CrMnSiA

0.28-0.34

0.90-1.20

0.80-1.10

0.80-1.10

 

 

 

 

 

 

 

GB/T 11251 30CrMnSiA alloy steel plates mechanical properties:

Grade

Tensile Strength [Mpa]

Elongation [%,min]

HBW (Max)

30CrMnSiA

550-750

19

229

Notes: 1) The mechanical properties of steel plates delivered in annealed state shall be in accordance with the provisions of the table below. The Brinell hardness of 30CrMnSiA is measured only when the demand is required.
2) The steel plates delivered in normalizing state, under the condition of elongation comply with the table, the upper limit of tensile strength is allowed to be increased by 50Mpa.
3) The steel plates with thickness above 20mm, when the thickness is increased by 1mm, the elongation is allowed to lower by 0.25% (absolute value) than that of the table, but it should not exceed 2% (absolute value).

GB/T 11251 30CrMnSiA alloy steel plates of BBN steel have good machinability, the pocessing deformation is small and fatigue resistance is good. BBN 30CrMnSiA alloy steel plates are used for all kinds of special wear resistant parts of automobile and aircraft.


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