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Quenched and Tempered Steel Plate RQT 701

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. Designers, engineers, and plant operators strive to reduce weight and increase the efficiency of equipment. There are significant benefits to be had by using high strength quenched and tempered steels for maximum structural performance in extreme working environments.

We often find that this type of material is called different things by different engineers. Plate to this specification and grade is variously described as:

· High Strength Quenched and Tempered Steel Plate

· High Yield Quenched and Tempered Steel Plate

· High Strength Structural Steel Plate,

· High Yield Structural Steel Plate

· High Strength Low Alloy Steel Plate

· HSLA

Chemical Composition – RQT® 701 Content % (ladle analysis), maximum - plates from 8 mm to 130 mm thick

C

Si

Mn

S

P

Cr

0.20

0.50

1.60

0.010

0.025

1.00

Mo

Nb

V

Ni

Cu

B

0.70

0.060

0.08

1.50

0.40

0.004

Carbon equivalent values

Maximum Ladle CEV (%)

8 mm to 30 mm thick

0.43

over 30 mm to 40 mm thick

0.55

over 40 mm to 100 mm thick

0.59

over 100 mm to 130 mm thick

0.61

Mechanical Properties - RQT® 701

8 to 70 mm thick

over 70 to 130 mm thick

Minimum Yield Strength (Mpa)

690

630

Tensile Strength (Mpa)

790 - 930

690 - 930

Minimum Elongation 50 mm Guage (%)

18

18

Minimum Average Impact Energy

30 J @ -40°C

30 J @ -40°C

Minimum Individual Impact Energy

21 J @ -40°C

21 J @ -40°C

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