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ASME SA335/SA335M
Scope
1.1 This specification 2 covers nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.Pipe ordered to this specification shall be suitable for bending,flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
1.2 Several grades of ferritic steels (Note 1) are covered.Their compositions are given in Table 1.
NOTE 1—Ferritic steels in this specification are defined as low and intermediate-alloy steels containing up to and including 10 % chromium.
1.3 Supplementary requirements (S1 to S7) of an optional nature are provided. These supplementary requirements call for additional tests to be made, and when desired, shall be so stated in the order together with the number of such tests required.
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.
NOTE 2—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”
Size Range:
Outer Diameter: 1/8″-48″
Wall Thickness Schedule: 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH
Lengths:Fixed length within the random lengths range
Tolerances on fixed lengths: +10/-0mm, for boiler tube and +50/-0mm for header pipe.
Maximum length up to 24mtr
Steel Grade:
P1 boiler tube for boiler replacement and repair
P5 boiler tube for petroleum
P9 boiler tube for petroleum
P11 boiler tube for power generation, petroleum, and other high temperature services
P22 boiler tube for power generation, petroleum, and other high temperature services
P91 boiler tube for power generation
Surface Conditions:
Mill Lacquered
Galvanized
Bare
End Finishes:
Beveled
Square
Threaded
Threaded and Coupled
Grooved
Protection:
Unprotected
If requird, the tubes can be delivered with plastic caps at both ends
Protection for sea transport on request
Chemical Composition
|
Grade |
Chemical Composition |
|||||||||
|
C |
Mn |
P max |
S max |
Si |
Cr |
Mo |
V |
N |
Others |
|
|
P1 |
0.1-0.2 |
0.3-0.8 |
0.025 |
0.025 |
0.1-0.5 |
1.0-1.5 |
0.44-0.65 |
/ |
/ |
/ |
|
P2 |
0.1-0.2 |
0.3-0.61 |
0.025 |
0.025 |
0.1-0.3 |
0.5-0.81 |
0.44-0.65 |
/ |
/ |
/ |
|
P5 |
≤0.15 |
0.3-0.6 |
0.025 |
0.025 |
≤0.5 |
4.0-6.0 |
0.45-0.65 |
/ |
/ |
/ |
|
P5b |
≤0.15 |
0.3-0.6 |
0.025 |
0.025 |
1.0-2.0 |
4.0-6.0 |
0.45-0.65 |
/ |
/ |
/ |
|
P5c |
≤0.12 |
0.3-0.6 |
0.025 |
0.025 |
≤0.5 |
4.0-6.0 |
0.45-0.65 |
/ |
/ |
/ |
|
P9 |
≤0.15 |
0.3-0.6 |
0.025 |
0.025 |
0.25-1.0 |
8.0-10.0 |
0.9-1.1 |
/ |
/ |
/ |
|
P11 |
0.05-0.15 |
0.3-0.6 |
0.025 |
0.025 |
0.5-1.0 |
1.0-1.5 |
0.44-0.65 |
/ |
/ |
/ |
|
P12 |
0.05-0.15 |
0.3-0.61 |
0.025 |
0.025 |
≤0.5 |
0.8-1.25 |
0.44-0.65 |
/ |
/ |
/ |
|
P15 |
0.05-0.15 |
0.3-0.6 |
0.025 |
0.025 |
1.15-1.65 |
/ |
0.44-0.65 |
/ |
/ |
/ |
|
P21 |
0.05-0.15 |
0.3-0.6 |
0.025 |
0.025 |
≤0.5 |
2.65-3.35 |
0.8-1.06 |
/ |
/ |
/ |
|
P22 |
0.05-0.15 |
0.3-0.6 |
0.025 |
0.025 |
≤0.5 |
1.9-2.6 |
0.87-1.13 |
/ |
/ |
/ |
|
P23 |
0.04-0.1 |
0.1-0.6 |
0.03 |
0.01 |
≤0.5 |
1.9-2.6 |
0.05-0.3 |
0.2-0.3 |
≤0.015 |
Cb(0.02-0.08) ,B(0.001-0.006) |
|
Al(≤0.03), W(1.45-1.75) |
||||||||||
|
Ni(≤0.4), Ti(0.005-0.060) |
||||||||||
|
P24 |
0.05-0.1 |
0.3-0.7 |
0.02 |
0.01 |
0.15-0.45 |
2.2-2.6 |
0.9-1.1 |
0.2-0.3 |
≤0.012 |
Ti(0.06-0.1), Al(≤0.02) |
|
B(0.0015-0.007) |
||||||||||
|
P36 |
0.1-0.17 |
0.8-1.2 |
0.03 |
0.025 |
0.25-0.50 |
≤0.30 |
0.25-0.50 |
≤0.02 |
≤0.02 |
Ni(1.0-1.3), Cu(0.5-0.8) |
|
Cb(0.015-0.045), Al(≤0.050) |
||||||||||
|
P91 |
0.08-0.12 |
0.3-0.6 |
0.02 |
0.01 |
0.2-0.5 |
8.0-9.5 |
0.85-1.05 |
0.18-0.25 |
0.03-0.07 |
Ni(≤0.4), Al(≤0.02), Cb(0.06-0.1) |
|
Ti(≤0.01), Zr(≤0.01) |
||||||||||
|
P92 |
0.07-0.13 |
0.3-0.6 |
0.02 |
0.01 |
≤0.50 |
8.5-9.5 |
0.3-0.6 |
0.15-0.25 |
0.03-0.07 |
Ni(≤0.4), AL(≤0.02), Cb(0.04-0.09) |
|
W(1.5-2.0), B(0.001-0.006) |
||||||||||
|
Ti(≤0.01), Zr(≤0.01) |
||||||||||
|
P122 |
0.07-0.14 |
≤0.7 |
0.02 |
0.01 |
≤0.50 |
10.0-11.5 |
0.25-0.6 |
0.15-0.3 |
0.04-0.1 |
Ni(≤0.5), Al(≤0.02), Ti(≤0.01) |
|
W(1.5-2.5), Cu(0.3-1.7), Zr(≤0.01) |
||||||||||
|
Cb(0.04-0.1), B(0.0005-0.005) |
||||||||||
|
P911 |
0.09-0.13 |
0.3-0.6 |
0.02 |
0.01 |
0.1-0.5 |
8.5-9.5 |
0.9-1.1 |
0.18-0.25 |
0.04-0.09 |
Ni(≤0.4), Cb(0.06-0.1) |
|
B(0.0003-0.006),Al(≤0.02) |
||||||||||
|
W(0.9-1.1),Ti(≤0.01),Zr(≤0.01) |
||||||||||
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