ASTM A608 Centrifugally Cast Iron Chromium Nickel Tubing
ASTM A608 Centrifugally Cast Iron Chromium Nickel Alloy Tubing for Pressure Application at High Temperature covers the standard for iron-chromium-nickel, high-alloy tubes made by the centrifugal casting process intended for use under pressure at high temperature. The tubing shall be supplied in the as cast condition or as cast with machining on the outside or inside surfaces.
The material shall conform to the required chemical composition in carbon, manganese, silicon, chromium, nickel, phosphorus, sulfur, and molybdenum. Tension test shall be performed in the tubing at elevated temperature and shall conform to the required values in tensile strength and elongation. Tubing shall meet several tests such as; pressure test, flattening test, and mechanical test.
ASTM A608 covers iron-chromium-nickel, high-alloy tubes made by the centrifugal casting process intended for use under pressure at high temperatures.
The grades of high alloys detailed in Table 1 are intended for applications requiring strength and resistance to corrosion and scaling at high temperatures.
Table 1 Chemical Requirements
| Grade |
Composition, % |
| Carbon |
Manganese |
Silicon |
Chromium |
Nickel |
Phosphorus |
Sulfur |
Molybdenum |
Niobium |
| 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 |
- |
| HH33 A |
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 |
- |
| HPNb |
0.38-0.45 |
0.50-1.50 |
0.50-1.50 |
24-27 |
34-37 |
0.03 |
0.03 |
0.50 |
0.5-1.5 |
| HPNbS |
0.38-0.45 |
0.50-1.50 |
1.50-2.50 |
24-27 |
34-37 |
0.03 |
0.03 |
0.50 |
0.5-1.5 |
| 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 |
- |
Manufacturing control should ensure that this composition contain a minimal amount of ferrite. See Supplementary Requirement S5.
Optional Supplementary Requirements S1 to S11 are provided; these call for additional tests to be made if desired.
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.
ASTM Standards
ASTM A342/A342M Test Methods for Permeability of Feebly Magnetic Materials
ASTM A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
ASTM A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
ASTM E8 Test Methods for Tension Testing of Metallic Materials
ASTM E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
ASTM E94 Guide for Radiographic Examination
ASTM E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
ASTM E142 Method for Controlling Quality of Radiographic Testing
ASTM E151 Recommended Practice for Tension Tests of Metallic Materials at Elevated Temperatures with Rapid Heating and Conventional or Rapid Strain Rates
ASTM E165 Practice for Liquid Penetrant Examination for General Industry
ASTM E340 Test Method for Macroetching Metals and Alloys
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