Low Alloy Steel Plate (ASTM A-SA-387)

Low Alloy Steel Plate (ASTM A-SA-387)

Extensively used in the high temperature conditions for welded boilers and pressure vessels, our Low Alloy Steel Plate (ASTM A-SA-387) has huge demand in the market. Our company stands tall among the reliable Suppliers, Importers and Exporters of Low Alloy Steel Plate (ASTM A-SA-387) from Maharashtra. Owing to our reliable logistics network, we are capable of delivering bulk orders of the Low Alloy Steel Plates.

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Plates are available under these specifications in several grades each having different nominal Chromium (Cr) and Molybdenum (Mo) contents as follows:

Grade Nominal Cr Content (%) Nominal Mo Content (%)
2 0.5 0.5
12 1 0.5
11 1.25 0.5
22, 22L 2.25 1
21, 21L 3 1
5 5 0.5
9, 91 9 1

 

Each grade except Grades 21L, 22L, and 91 is available in two classes of tensile strength described as Class 1 and Class 2. The most regularly specified grades and hence those that are most readily available from stock are Grades 12, 11, 22, 5, and 9 and in most case stock plates will be produced to the tensile requirements of Class 2. 


Chemical Requirements

(cast analysis, % by mass, maximum permitted unless indicated otherwise)

 

  Gr. 2 Gr. 12 Gr. 11 Gr. 22 Gr. 22L Gr. 21 Gr. 21L Gr. 5  Gr. 9 Gr. 91*
C 0.05-0.21 0.05-0.17 0.05-0.17 0.05-0.15 0.1 0.05-0.15  0.10   0.15  0.15 0.08-0.12 
Mn 0.55-0.80 0.40-0.65  0.40-0.65 0.30-0.60  0.30-0.60  0.30-0.60  0.30-0.60  0.30-0.60  0.30-0.60  0.30-0.60 
P 0.025 0.025  0.025 0.025 0.025  0.025  0.025  0.025  0.025  0.020 
S 0.025 0.025  0.025  0.025  0.025  0.025  0.025  0.025  0.025  0.010 
Si 0.15-0.40 0.15-0.40  0.50-0.80 0.5 0.50  0.5 0.5 0.5 1.00  0.20-0.50 
Cr 0.50-0.80 0.80-1.15  1.00-1.50  2.00-2.50 2.00-2.50 2.75-3.25 2.75-3.25 4.00-6.00 8.00-10.00  8.00-9.50
Mo 0.45-0.60 0.45-0.60  0.45-0.65 0.90-1.10  0.90-1.10 0.90-1.10 0.90-1.10 0.45-0.65 0.90-1.10 0.85-1.05 
V  -  -  - -  -  -  - - 0.04  0.18-0.25

Tensile Requirements

Class 1 Plates

Grade Tensile (MPa) Yield (MPa) Elong. (50mm) Reduc'n of Area*
2, 12 380 - 550 230 min 22% min -
11 415 - 585 240 min 22% min -
22, 21, 5, 9 415 - 585 205 min 18% min 40% min
21L, 22L  415 - 585 205 min 18% min 40% min

Class 2 Plates

Grade Tensile (MPa) Yield (MPa) Elong. (50 mm) Reduc'n of Area*
 2 485 - 620 310 min 22% min -
11 515 - 690 310 min 22% min  -
12 450 - 585 275 min 22% min -
22, 21, 5, 9 515 - 690 310 min 18% min 40% min
91 585 - 760 415 min 18% min -


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