1. Scope
1.1 This specification covers iron-chromium-nickel, high-alloy tubes made by the centrifugal casting process intended for use under pressure at high temperatures.
1.2 The grades of high alloys detailed in Table 1 are intended for applications requiring strength and resistance to corrosion and scaling at high temperatures.
1.3 Optional Supplementary Requirements S1 to S11 are provided; these call for additional tests to be made if desired.
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 each other. Combining values from the two systems may result in nonconformance with the specification.
TABLE 1 Chemical Requirements
| Grade | Composition, % |
|---|
| Carbon | Manganese | Silicon | Chromium | Nickel | Phosphorus | Sulfur | Molybdenum |
|---|
| HC30 | 0.25–0.35 | 0.5–1.0 | 0.50–2.00 | 26–30 | 4.0 max | 0.04 max | 0.04 max | 0.50 max |
| HD50 | 0.45–0.55 | 1.50 max | 0.50–2.00 | 26–30 | 4–7 | 0.04 max | 0.04 max | 0.50 max |
| HE35 | 0.30–0.40 | 1.50 max | 0.50–2.00 | 26–30 | 8–11 | 0.04 max | 0.04 max | 0.50 max |
| HF30 | 0.25–0.35 | 1.50 max | 0.50–2.00 | 19–23 | 9–12 | 0.04 max | 0.04 max | 0.50 max |
| HH30 | 0.25–0.35 | 1.50 max | 0.50–2.00 | 24–28 | 11–14 | 0.04 max | 0.04 max | 0.50 max |
| HH33A | 0.28–0.38 | 1.50 max | 0.50–2.00 | 24–26 | 12–14 | 0.04 max | 0.04 max | 0.50 max |
| HI35 | 0.30–0.40 | 1.50 max | 0.50–2.00 | 26–30 | 14–18 | 0.04 max | 0.04 max | 0.50 max |
| HK30 | 0.25–0.35 | 1.50 max | 0.50–2.00 | 23–27 | 19–22 | 0.04 max | 0.04 max | 0.50 max |
| HK40 | 0.35–0.45 | 1.50 max | 0.50–2.00 | 23–27 | 19–22 | 0.04 max | 0.04 max | 0.50 max |
| HL30 | 0.25–0.35 | 1.50 max | 0.50–2.00 | 28–32 | 18–22 | 0.04 max | 0.04 max | 0.50 max |
| HL40 | 0.35–0.45 | 1.50 max | 0.50–2.00 | 28–32 | 18–22 | 0.04 max | 0.04 max | 0.50 max |
| HN40 | 0.35–0.45 | 1.50 max | 0.50–2.00 | 19–23 | 23–27 | 0.04 max | 0.04 max | 0.50 max |
| HT50 | 0.40–0.60 | 1.50 max | 0.50–2.00 | 15–19 | 33–37 | 0.04 max | 0.04 max | 0.50 max |
| HU50 | 0.40–0.60 | 1.50 max | 0.50–2.00 | 17–21 | 37–41 | 0.04 max | 0.04 max | 0.50 max |
| HW50 | 0.40–0.60 | 1.50 max | 0.50–2.00 | 10–14 | 58–62 | 0.04 max | 0.04 max | 0.50 max |
| HX50 | 0.40–0.60 | 1.50 max | 0.50–2.00 | 15–19 | 64–68 | 0.04 max | 0.04 max | 0.50 max |
A Manufacturing control should ensure that this composition contain a minimal amount of ferrite. See Supplementary Requirement S5.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
A342/A342M Test Methods for Permeability of Feebly Magnetic Materials
A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
E8 Test Methods for Tension Testing of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E94 Guide for Radiographic Examination
E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
E142 Method for Controlling Quality of Radiographic Testing
E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
E165 Practice for Liquid Penetrant Examination for General Industry
E340 Test Method for Macroetching Metals and Alloys
Keywords
alloy; centrifugal casting; high temperatures; pressure containing parts; steel tube; temperature service applications;
ICS Code
ICS Number Code 23.040.10 (Iron and steel pipes); 23.040.40 (Metal fittings)
DOI: 10.1520/A0608_A0608M-06R12
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Citing ASTM Standards
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