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Abstract
This guide covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium. The number of tubes in a lot heat treated by the continuous process shall be determined from the size of the tubes. The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation. The tubes shall have a hardness number that will not exceed the prescribed Brinell and Rockwell hardness values. Several mechanical tests shall be conducted, namely: tension test; flaring test (for seamless tubes); flange test (for welded tubes); hardness test; reverse flattening test; intergranular corrosion test; and hydrostatic or nondestructive electric test.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification2 covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500 (Table 1), are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures. These features should be recognized in the use of these materials.
TABLE 1 Continued | |||||||||||||||||
Grade | TP439 | . . . | . . . | TP430 Ti | TP | TP | 18Cr-2Mo | 29-4 | 29-4-2 | 26-3-3 | 25-4-4 | ... | . . . | . . . | . . . | . . . | TP468 |
UNS | S43035 | S43932 | S41500B | S43036 | S44627 | S44626 | S44400 | S44700 | S44800 | S44660 | S44635 | S44735 | S32803 | S40977 | S43940 | S42035 | S46800 |
Element | Composition, % | ||||||||||||||||
C, max | 0.07 | 0.030 | 0.05 | 0.10 | 0.01A | 0.06 | 0.025 | 0.010 | 0.010 | 0.030 | 0.025 | 0.030 | 0.015C | 0.03 | 0.03 | 0.08 | 0.030 |
Mn, max | 1.00 | 1.00 | 0.5–1.0 | 1.00 | 0.40 | 0.75 | 1.00 | 0.30 | 0.30 | 1.00 | 1.00 | 1.00 | 0.5 | 1.50 | 1.00 | 1.00 | 1.00 |
P, max | 0.040 | 0.040 | 0.03 | 0.040 | 0.02 | 0.040 | 0.040 | 0.025 | 0.025 | 0.040 | 0.040 | 0.040 | 0.020 | 0.040 | 0.040 | 0.045 | 0.040 |
S, max | 0.030 | 0.030 | 0.03 | 0.030 | 0.02 | 0.020 | 0.030 | 0.020 | 0.020 | 0.030 | 0.030 | 0.030 | 0.005 | 0.015 | 0.015 | 0.030 | 0.030 |
Si, max | 1.00 | 1.00 | 0.60 | 1.00 | 0.40 | 0.75 | 1.00 | 0.20 | 0.20 | 1.00 | 0.75 | 1.00 | 0.50 | 1.00 | 1.00 | 1.00 | 1.00 |
Ni | 0.50 max | 0.50 | 3.5–5.5 | 0.75 max | 0.5D max | 0.50 max | 1.00 max | 0.15 max | 2.0–2.5 | 1.0–3.50 | 3.5–4.5 | 1.00 max | 3.0–4.0 | 0.30–1.00 | . . . | 1.0–2.5 | 0.50 |
Cr | 17.00– | 17.0–19.0 | 11.5–14.0 | 16.00– | 25.0–27.5 | 25.0–27.0 | 17.5–19.5 | 28.0–30.0 | 28.0–30.0 | 25.0–28.0 | 24.5–26.0 | 28.00– | 28.0– | 10.50– | 17.50– | 13.5– | 18.00– |
| 19.00 |
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| 19.50 |
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| 30.00 |
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Mo | ... | ... | 0.5–1.0 | ... | 0.75–1.50 | 0.75–1.50 | 1.75–2.50 | 3.5–4.2 | 3.5–4.2 | 3.0–4.0 | 3.5–4.5 | 3.60–4.20 | 1.8–2.5 | . . . | . . . | 0.2–1.2 | . . . |
Al, max | 0.15 | 0.15 | . . . | ... | ... | ... | ... | ... | ... | ... | ... | ... | . . . | . . . | . . . | . . . | . . . |
Cu, max | ... | ... | . . . | ... | 0.2 | 0.20 | ... | 0.15 | 0.15 | ... | ... | ... | . . . | . . . | . . . | . . . | . . . |
N, max | 0.04 | 0.030 (Ti + Cb) {0.20 + 4 (C + N)} min.; 0.75 max | . . . | ... | 0.015 | 0.040 | 0.035 | 0.020E | 0.020E | 0.040 | 0.035 | 0.045 | 0.020 | 0.030 | . . . | . . . | 0.030 |
Ti | 0.20 + 4 (C |
| . . . | 5 × C min; | ... | 7 × (C + N) | (Ti + Cb) | ... | ... | (Ti + Cb) = | (Ti + Cb) = | (Ti + Cb) = | . . . | . . . | 0.10–0.60 | 0.30–0.50 | 0.07–0.30 |
| + N) min; |
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| 0.75 max |
| but no less | 0.20 + 4 |
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| 0.20–1.00 | 0.20 + 4 | 0.20–1.00 |
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| 1.10 max |
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| than 0.20 | (C + N) |
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| and 6 × | (C + N) | and 6 × |
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Link Here | |||
Link to Active (This link will always route to the current Active version of the standard.) | |||
DOI: 10.1520/A0268_A0268M-20
Citation Format
ASTM A268 / A268M-20, Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service, ASTM International, West Conshohocken, PA, 2020, www.astm.org
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