Technical conditions for plates of SA387Gr11CL2 HIC

1.       Scope

The technical conditions apply to plates of SA387Gr11CL2 HIC with thickness range 10mm-120mm use of CNPC's Karamay project.

2.       Adopt standard:

ASME SA387/SA387M Specification for pressure vessel plates, alloy steel, Chromium-Molybdenum

ASME SA20/SA20M Standard Specification for General Requirements for Steel Plates for Pressure Vessels

ASME SA370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products

3.       Dimension, Shape, Weight and Permissible Deviation

The dimension, shape, weight and permissible deviation shall meet the requirements of ASME SA20/SA20M.

The thickness toleration: -0/+3.5mm

4.       Technical conditions

4.1   Chemical composition (Ladle analysis)

The chemical composition of plates shall be accordance with the following table 1.

Table 1 Chemical composition (Ladle analysis)

Note:

1)      Si+Mn =< 1.2%

2)      Mark "*" just record the value.

4.2   Steel making process: EAF+LF/VD

4.3   Mechanical properties

The mechanical properties of SA387Gr11CL2 HIC shall meet the requirement as table 2&3.

Table 2 Tensile properties

4.4   Impact properties

Impact test in the longitudinal and transverse for plates of SA387Gr11CL2 HIC shall meet the requirements per table 3.

Table 3 Impact properties

4.5   Hardness: Max 22HRC

4.6   SWHT: Simulated Post-Weld Heat Treatment of Mechanical Test Coupons shall be prepared in 600+/-10 C with min.5 minute per each mm of thickness.

4.7   NACE MR0175/ISO 15156-2 / Annex B.5 / Test method NACE TM0284 in solution-A sour service (CLR =< 5% & CTR =<5% & CSR =< 2% shall be reported)

4.8   Surface quality

The surface quality of plates shall be accordance with ASTM A20/A20M.

4.9   Ultrasonic inspection

Plates shall be ultrasonic inspected per ASTM A578/A578M level B.

4.10    Test method and inspection rules

Test items, sampling quantity, sampling method and test method shall conform to table 4.

Table 4 Test items for plates

5.       HIC sampling method: Per heat number/ thickness/ heat treatment rules combine one group.

6.       Package, marking and certificate

Package, marking and certificate shall conform to A20.

7.       The third party inspection

The chemical composition, tensile test and Charpy -V impact test and HIC test for plates of SA387Gr11CL2 HIC shall be witnessed by surveyor of SGS.

8.       Delivery conditions

The delivery conditions for plates of SA387Gr11CL2 HIC shall be Normalized(accept ACCP)+ Tempered(temperature not less than 700 C degree.)

9.       Other requirements

The other requirements for plates of SA387Gr11CL2 HIC shall be accordance with SA387/SA387M-2010.

MTC accordance with EN10204: 2004 3.1