The Project for A517GrQ especially thick steel plates

Author:Forward steel Time:2014-10-27

A.      Application scope
These technical conditions apply to the manufacture and examination for 177.8mm thickness A517GrQ steel plates of CICS.
B.      Reference standards
ASTM A517/A517M Specification for Quenched and Tempered higher strength alloy steel plates for pressure vessels.
ASTM A20/A20M Specification for General Requirements for Hot Rolled Structural Steel Plates, Sheet Pilling, and Steel Bars
ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
C.      Permissible deviation in size, outline and weight
The permissible deviation in size, outline and weight shall conform to specification ASTM A20/A20M. The straightness of steel plates should be not more than 4mm/m.
Permissible deviation of the thickness: 1.52mm.
D.     Technical Requirements
1.       A517GrQ Chemical Composition(Melting Analysis)

C Si Mn P S Ni Cr Mo V
≤0.18 0.15~0.35 0.95~1.30 ≤0.035 ≤0.010 1.20~1.50 1.00~1.50 0.40~0.60 0.030~0.080
2.       Delivery Condition: Quenched and Tempered
3.       Mechanical property A517GrQ
The results of inspection should comply with table 2
Mechanical Property Impact test T/4 Impact test T/2 Hardness test T/4 HB
Yield Strength Mpa Tensile Strength Mpa Reduction of are  
Impact energy
Impact energy







E.      Surface Quality  A517GrQ
The surface quality of steel plate should apply to the specification ASTM A20/A20M
F.      Ultrasonic flaw detection
The steel plates must pass though Ultrasonic flaw detection totally, and comply with GB2970-2004 Ⅰ
G.     Inspection items, Inspection rules and Experimental methods
1.           The rolled steel plates should be examined one by one in batches.
2.           The inspection items, sampling number ,sampling methods and experimental methods in every batch should apply to table3.

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