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SA-387 Grades 12, 11, 22, 5, 9, 91

Overview

More common application of this grade are in 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 Quenched and Tempered. For more severe environments we can perform API 934 Testing to supplement this grade.

Chemical Requirements

*Elements represented in percentage

Element Composition %
Grade
12
Grade
11
Grade
22
Grade
5
Grade
9
Grade
91
Carbon, max:
Heat analysis 0.05-0.17 0.05-0.17 0.05-0.15A 0.15 max 0.15 max 0.08-0.12
Product analysis 0.04-0.17 0.04-0.17 0.04-0.15A 0.15 max 0.15 max 0.06-0.15
Manganese, max:
Heat analysis 0.40-0.65 0.40-0.65 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60
Product analysis 0.35-0.73 0.35-0.73 0.25-0.66 0.25-0.66 0.25-0.66 0.25-0.66
Phosphorus, max:
Heat analysis 0.025 0.025 0.025 0.025 0.025 0.020
Product analysis 0.025 0.025 0.025 0.025 0.025 0.025
Sulfur, max:
Heat analysis 0.025 0.025 0.025 0.025 0.025 0.010
Product analysis 0.025 0.025 0.025 0.025 0.025 0.012
Silicon:
Heat analysis 0.15-0.40 0.50-0.80 0.50 max 0.50 max 1.00 max 0.20-0.50
Product analysis 0.13-0.45 0.44-0.86 0.50 max 0.55 max 1.05 max 0.18-0.56
Chromium:
Heat analysis 0.80-1.15 1.00-1.50 2.00-2.50 4.00-6.00 8.00-10.00 8.00-9.50
Product analysis 0.74-1.21 0.94-1.56 1.88-2.62 3.90-6.10 7.90-10.10 7.90-9.60
Molybdenum:
Heat analysis 0.45-0.60 0.45-0.65 0.90-1.10 0.45-0.65 0.90-1.10 0.85-1.05
Product analysis 0.40-0.65 0.40-0.70 0.85-1.15 0.40-0.70 0.85-1.15 0.80-1.10

Tensile Requirements For Class 1 Plates

Grade 12 Grade 11 Grade 22, 5, 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. % 18 19
Elongation in 2 in. [50 mm], min. % 22 22 18
Reduction of area, min % 45
40

Tensile Requirements For Class 2 Plates

Grade 11 Grade 12 Grade 22, 5, 9 Grade 91
Tensile strength, ksi [MPa] 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] 40 [275] 45 [310] 60 [415]
Elongation in 8 in. [200 mm], min. %B 18 19
Elongation in 2 in. [50 mm], min. %B 22 22 18 18
Reduction of area, min % 45
40
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