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T8-T10A hot rolled steel round bars

T8, T10 and T12 are carbon tool steels. They are very hard. The Brinell hardness in annealed state is more than 300.Manual saw blade is T12 material, just quenching, hardness is greater.10 and 20 are low carbon, high quality structural steel, very soft, Brinell hardness is less than 155.Therefore, the fitter saw, laborious, the saw is very easy to wear.
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A537 CL1 Normalized Pressured Vessel Steel Plate

ASTM A537 standard refers to pressure vessel plates, material in heat-treated, carbon-manganese silicon steel. Based on different strength and heat treatment, it ranges to Class 1, 2 and 3.
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ASTM A131 AH32 DH32 EH32 FH32 Shipbuilding Steel Plate

Higher strength- Grade AH, DH ,EH and FH witha specified minimum yield point of
46 ksi(315Mpa),51ksi(350Mpa) or 57 ksi(390Mpa) Shapes and bars are normally
available as Grade A,AH32,and AH36.Other grades may be furnished by agreement
between purchaser and the manufacturer.
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A612 steel

This specification covers killed carbon- manganese-silicon steel plates intended for welded pressure vessels in service at moderate and lower temperatures. As a steel making practice, the steel shall be killed and shall conform to specified fine austenitic grain size requirements.
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ASTM A131 A B D E CS Shipbuilding Plate

ASTM A131 is A structural grade of steel plate utilized almost exclusively in the shipbuilding industry.
This grade is defined as ordinary strength with specified minimum yield of 34KSI(235Mpa).
Applications include barges, marine equipment and ship construction.
These grades are also certified by the American Bureau of Shipping(ABS)
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A537 CLASS 2 Heat treated Boiler steel plate

ASTM A537 standard refers to pressure vessel plates, material in heat-treated, carbon-manganese silicon steel. Based on different strength and heat treatment, it ranges to Class 1, 2 and 3. The maximum thickness under ASTM A537 Class 1 is 100 mm [4 inch], and 150 mm [6 inch] for Class 2 and Class 3.
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