ASME B31.3-2012

Table 330.1.1 Preheat Temperatures

(12)

Base Metal P-No. [Note (1)]

Weld Metal Analysis A-No. [Note (2)]

Nominal Wall Thickness Base Metal Group

mm

in.

Specified Minimum Tensile Strength, Base Metal

Required Minimum Temperature

MPa

°C

°F

ksi

1

1

Carbon steel

< 25 ≥ 25 All

<1 ≥1 All

≤ 490 All > 490

≤ 71 All > 71

10 80 80

50 175 175

3

2, 11

Alloy steels, Cr ≤ 1⁄2%

< 13 ≥ 13 All

< 1⁄2 ≥ 1⁄2 All

≤ 490 All > 490

≤ 71 All > 71

10 80 80

50 175 175

4

3

Alloy steels, 1 ⁄2% < Cr ≤ 2%

All

All

All

All

120

250

5A, 5B, 5C

4, 5

Alloy steels, 21⁄4% ≤ Cr ≤ 10%

All

All

All

All

175

350

6

6

High alloy steels martensitic

All

All

All

All

2004

4004

7

7

High alloy steels ferritic

All

All

All

All

10

50

8

8, 9

High alloy steels austenitic

All

All

All

All

10

50

9A 9B

10 10

Nickel alloy steels Nickel alloy steels

All All

All All

All All

All All

120 150

250 300

10

...

Cr–Cu steel

All

All

All

All

150

300

10I

...

27Cr steel

All

All

All

All

1503

3003

11A SG 1 11A SG 2

... ...

8Ni, 9Ni steel 5Ni steel

All All

All All

All All

All All

10 10

50 50

15E

5

Alloy steels 9Cr–1Mo–V

All

All

All

All

200

400

21–52

...

...

All

All

All

All

10

50

--``,,,,,`,````,```,`,,```,,`,`,-`-`,,`,,`,`,,`---

NOTES: (1) P-Number from BPV Code, Section IX, QW/QB-422. (2) A-Number from Section IX, QW-442. (3) Maintain interpass temperature between 175°C–230°C (350°F–450°F). (4) Maximum interpass temperature 315°C (600°F).

66

Table 330.1.1 Preheat Temperatures -

Required Minimum. Base Metal. Analysis. Thickness. Base Metal. Temperature. P-No. A-No. [Note (1)]. [Note (2)]. Base Metal Group mm in. MPa ksi. °C. °F. 1. 1.
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