QW-440
QW-441
WELD METAL CHEMICAL COMPOSITION
GENERAL
Identification of weld metal chemical composition designated on the PQR and WPS shall be as given in QW-404.5.
Table QW-442
A-Numbers
Classification of Ferrous Weld Metal Analysis for Procedure Qualification
Analysis, % [Note (1)] and [Note (2)]
A‐No.
Types of Weld Deposit
C
Cr
Mo
Ni
Mn
Si
1
Mild Steel
0.20
0.20
0.30
0.50
1.60
1.0
2
Carbon‐Molybdenum
0.15
0.50
0.40–0.65
0.50
1.60
1.0
3
4
5
Chrome (0.4% to 2%)‐Molybdenum
Chrome (2% to 4%)‐Molybdenum
Chrome (4% to 10.5%)‐Molybdenum
0.15
0.15
0.15
0.40–2.00
2.00–4.00
4.00–10.5
0.40–0.65
0.40–1.50
0.40–1.50
0.50
0.50
0.80
1.60
1.60
1.20
1.0
2.0
2.0
6
Chrome‐Martensitic
0.15
11.0–15.0
0.70
0.80
2.00
1.0
7
Chrome‐Ferritic
0.15
11.0–30.0
1.00
0.80
1.00
3.0
8
9
Chromium‐Nickel
Chromium‐Nickel
0.15
0.30
14.5–30.0
19.0–30.0
4.00
6.00
7.50–15.0
15.0–37.0
2.50
2.50
1.0
1.0
10
Nickel to 4%
0.15
0.50
0.55
0.80–4.00
1.70
1.0
11
Manganese‐Molybdenum
0.17
0.50
0.25–0.75
0.85
1.25–2.25
1.0
12
Nickel–Chrome—Molybdenum
0.15
1.50
0.25–0.80
1.25–2.80
0.75–2.25
1.0
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NOTES:
(1) Single values shown above are maximum.
(2) Only listed elements are used to determine A-numbers.
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