December 4, 2018

Carbon Steel BS3100 GR A6

Carbon steel Grade A6 is one British steel casting material, which is a popular carbon-manganese steel material in casting purpose.

Grade A6 is a special grade steel which same chemistry as Grade A5, but different heat treatment requirement for better mechanical property. It’s same as G28Mn6 with QT2 heat treatment.

BS3100 standard which is superseded by BS EN10293:2005.

BS 3100:1991 Specification for steel castings for general engineering purposes

BS 3100 Grade A6 Casting Chemical Requirements and Mechanical Property:
Carbon: 0.18-0.25max
Manganese: 1.20-1.60
Silicon: 0.60 max
Sulfur: 0.050 max
Phosphorus: 0.050 max
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Grade A6 TENSILE REQUIREMENT IN STANDARD.
Tensile Strength: 690-850Mpa min
Yield Strength: 495Mpa min
Elongation: 13.0% min
Charpy V-notch: 25J @ 20° C.
Hardness values for Castings: 201-255HB(Brinell Hardness)  www.castingquality.com

BS3100 Gr. A6 Casting Heat treatment process: Generally all castings (up to 63mm thickness) need to be OQ+T; or WQ+T

A – For anneal by heating to a temperature above the AC3 and cool in the furnace.
N – For normalize by heating to a temperature above AC3 and cool in the still air.
OQ – For quench into oil from a temperature above AC3
WQ – For Quench into water from a temperature above AC3
AH – For air harden by heating to a temperature above AC3 and cool in air at a rate fast enough to produce a hardened microstructure
T – For temper by heating to a temperature below AC1.
ST – For solution treat by heating to a temperature high enough to dissolve carbides and any into intermetallic phases followed by a rapid cool.

Steel Manufacture Process: Sand Casting, Precision Lost Wax Investment Casting.

 

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