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Chromium-Molybdenum Alloy Steel Pressure Vessel Plates
 

SA-387

Overview

More common applications of this grade is Refineries, Power Plants, and certain areas of Chemical Plants in environments with elevated temperatures and limited corrosion concerns. These grades can be specified in either class 1 or 2. It can also be provided in the Normalized & Tempered or Annealed conditions. The annealing process – which would meet Class 1 properties, “softens” the steel to enhance greater forming capabilities.

 Download SA-387 Chemical and Tensile Requirements PDF (66 KB)

Chemical Requirements

ElementComposition %
Grade
2
Grade
12
Grade
11
Grade
22
Grade
21
Grade
5
Grade
7
Grade
9
Grade
91
Carbon, max:
Heat anal. 0.05-0.21 0.05-0.17 0.05-0.17 0.05-0.15A 0.05-0.15A 0.15 max 0.15 max 0.15 max 0.08-0.12
Product anal. 0.04-0.21 0.04-0.17 0.04-0.17 0.04-0.15A 0.04-0.15A 0.15 max 0.15 max 0.15 max 0.06-0.15
Manganese, max:
Heat anal. 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
Product anal. 0.50-0.88 0.35-0.73 0.35-0.73 0.25-0.66 0.25-0.66 0.25-0.66 0.25-0.66 0.25-0.66 0.25-0.66
Phosphorus, max:
Heat anal. 0.035 0.035 0.035 0.035 0.035 0.040 0.030 0.030 0.020
Product anal. 0.035 0.035 0.035 0.035 0.035 0.040 0.030 0.030 0.025
Sulfur, max:
Heat anal. 0.040 0.040 0.040 0.035 0.035 0.030 0.030 0.030 0.010
Product anal. 0.040 0.040 0.040 0.035 0.035 0.030 0.030 0.030 0.012
Silicon:
Heat anal. 0.15-0.40 0.15-0.40 0.50-0.80 0.50 max 0.50 max 0.50 max 1.00 max 1.00 max 0.20-0.50
Product anal. 0.13-0.45 0.13-0.45 0.44-0.86 0.50 max 0.50 max 0.55 max 1.05 max 1.05 max 0.18-0.56
Chromium:
Heat anal. 0.50-0.80 0.80-1.15 1.00-1.50 2.00-2.50 2.75-3.25 4.00-6.00 6.00-8.00 8.00-10.00 8.00-9.50
Product anal. 0.46-0.85 0.74-1.21 0.94-1.56 1.88-2.62 2.63-3.37 3.90-6.10 5.90-8.10 7.90-10.10 7.90-9.60
Molybdenum:
Heat anal. 0.45-0.60 0.45-0.60 0.45-0.65 0.90-1.10 0.90-1.10 0.45-0.65 0.45-0.65 0.90-1.10 0.85-1.05
Product anal. 0.40-0.65 0.40-0.65 0.40-0.70 0.85-1.15 0.85-1.15 0.40-0.70 0.40-0.70 0.85-1.15 0.80-1.10
Nickel, max:
Heat anal. ... ... ... ... ... ... ... ... 0.40
Product anal. ... ... ... ... ... ... ... ... 0.43
Vanadium:
Heat anal. ... ... ... ... ... ... ... ... 0.18-0.25
Product anal. ... ... ... ... ... ... ... ... 0.16-0.27
Columbium:
Heat anal. ... ... ... ... ... ... ... ... 0.06-0.10
Product anal. ... ... ... ... ... ... ... ... 0.05-0.11
Nitrogen:
Heat anal. ... ... ... ... ... ... ... ... 0.030-0.070
Product anal. ... ... ... ... ... ... ... ... 0.025-0.080
Aluminum, max:
Heat anal. ... ... ... ... ... ... ... ... 0.04
Product anal. ... ... ... ... ... ... ... ... 0.05

AThe carbon content for plates over 5 in. (125 mm) in thickness is 0.17 max on product analysis.

Tensile Requirements For Class 1 Plates

 Grade 2 and 12Grade 11Grade 22, 21, 5, 7, 9
Tensile strength, ksi [MPa] 55 to 80 [380 to 550] 60 to 85 [415 to 585] 60 to 85 [415 to 585]
Yield strength min. ksi [MPa] 33 35 30
Elongation in 8 in. [200 mm], min. %A 18 19  
Elongation in 2 in. [50 mm], min. %A 22 22 18
Reduction of area, min %     45B
40C

ASee Specification A 20/A 20M.
BMeasured on round test specimens.
CMeasured on flat specimen

Tensile Requirements For Class 2 Plates

 Grade 2Grade 11Grade 12Grade 22, 21, 5, 7, 9Grade 91
Tensile strength, ksi [MPa] 70 to 90
[485 to 620]
75 to 100
[515 to 690]
65 to 85
[450 to 585]
75 to 100
[515 to 690]
85 to 110
[585 to 760]
Yield strength min. ksi [MPal]/(0.2% offset) 45 [310] 45 [310] 40 [275] 45 [310] 60 [415]
Elongation in 8 in. [200 mm], min. %B 18 18 19 ... ...
Elongation in 2 in. [50 mm], min. %B 22 22 22 18 18
Reduction of area, min % ... ... ... 45C
40D
...

ANot applicable to anneaied material.
BSee Specification A 20/A 20M. elongation adjustments
CMeasured on round test specimen
DMeasured on flat specimen