Реферат

This specification covers seamless ferritic alloy-steel pipe for high-temperature service. The pipe shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Grade P2 and P12 steel pipes shall be made by coarse-grain melting practice. The steel material shall conform to chemical composition, tensile property, and hardness requirements. Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices. The range of pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practices. The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.

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1.1 This specification covers nominal wall and minimum wall seamless ferritic 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 (see 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 SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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.”

TABLE 1 Chemical Requirements

Grade
UNS
Designa-
tion^A
Composition, %
Carbon
Man-
ganese
Phos-
phorus,
max
Sulfur,
max
Silicon
Chromium
Molybde-
num
Others
P1 K115220.10–0.200.30–0.80 0.0250.025 0.10–0.50 . . . 0.44–0.65 . . . P2 K115470.10–0.200.30–0.61 0.0250.025 0.10–0.30 0.50–0.81 0.44–0.65 . . . P5 K415450.15 max0.30–0.600.0250.0250.50 max 4.00–6.00 0.45–0.65 . . . P5b K515450.15 max0.30–0.600.0250.0251.00–2.004.00–6.00 0.45–0.65 . . . P5c K412450.12 max0.30–0.600.0250.0250.50 max 4.00–6.00 0.45–0.65 . . .^B P9 S504000.15 max0.30–0.600.0250.0250.25–1.008.00–10.00 0.90–1.10 . . . P11 K115970.05–0.150.30–0.60 0.0250.025 0.50–1.00 1.00–1.50 0.44–0.65 . . . P12 K115620.05–0.150.30–0.61 0.0250.025 0.50 max0.80–1.250.44–0.65 . . . P15 K115780.05–0.150.30–0.60 0.0250.025 1.15–1.65 . . . 0.44–0.65 . . . P21 K315450.05–0.150.30–0.60 0.0250.025 0.50 max2.65–3.350.80–1.06 . . . P22 K215900.05–0.150.30–0.60 0.0250.025 0.50 max1.90–2.600.87–1.13 . . . P23K416500.04–0.100.10–0.600.030 max0.010 max0.50 max1.90–2.600.05–0.30V 0.20–0.30
Cb 0.02–0.08
B 0.0010–0.006
N 0.015 max
Al 0.030 max
W 1.45–1.75
Ni 0.40 max
Ti 0.005–0.060
Ti/N ≥ 3.5^C P24K307360.05–0.100.30–0.700.0200.0100.15–0.452.20–2.600.90–1.10V 0.20–0.30
Ti 0.06–0.10
N 0.012 max
Al 0.02 max
B 0.0015–0.007 P36K210010.10–0.170.80–1.200.030 max0.025 max0.25–0.500.30 max0.25–0.50Ni 1.00-1.30
Cu 0.50-0.80
Cb 0.015-0.045
V 0.02 max
N 0.02 max
Al 0.050 max P91 K915600.08–0.120.30–0.60 0.0200.010 0.20–0.50 8.00–9.50 0.85–1.05 V 0.18–0.25 N 0.030–0.070 Ni 0.40 max Al 0.02 max Cb 0.06–0.10 Ti 0.01 max Zr 0.01 max P92 K92460 0.07–0.13 0.30–0.60 0.020 0.010 0.50 max 8.50–9.50 0.30–0.60 V 0.15–0.25
N 0.03–0.07
Ni 0.40 max
Al 0.02 max
Cb 0.04–0.09
W 1.5–2.00
B 0.001–0.006
Ti 0.01 max
Zr 0.01 max P122 K92930 0.07–0.14 0.70 max 0.020 0.010 0.50 max 10.00–11.50 0.25–0.60 V 0.15–0.30
W 1.50–2.50
Cu 0.30–1.70
Cb 0.04–0.10
B 0.0005–0.005
N 0.040–0.100
Ni 0.50 max
Al 0.020 max
Ti 0.01 max
Zr 0.01 max P911K910610.09–0.130.30–0.600.020 max0.010 max0.10–0.508.5–9.50.90–1.10V 0.18–0.25
Ni 0.40 max
Cb 0.060–0.10
B 0.0003–0.006
N 0.04–0.09
Al 0.02 max
W 0.90–1.10
Ti 0.01 max
Zr 0.01 max

^A New designation established in accordance with Practice E527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).

^B Grade P 5c shall have a titanium content of not less than 4 times the carbon content and not more than 0.70 %; or a columbium content of 8 to 10 times the carbon content.

^C Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering. Hardness testing shall be performed at mid-thickness of the product. Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.