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ACI Designation
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SAE
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UNS Number
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ASTM Specifications
(a) |
Compositions (b), %
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| C max. | Cr | Ni | Si max. | ||||
| HA | - | - | A217 | 0.20 | 8 to 10 | 1.00 | |
| HC | - | - | A297,A608 | 0.50 | 26 to 30 | 4 max | 2.00 |
| HD | - | J93005 | A297, A608 | 0.50 | 26 to 30 | 4 to 7 | 2.00 |
| HE | 70312 | J93403 | A297, A608 | 0.35 | 26 to 30 | 8 to 11 | 2.00 |
| HF | 70308 | J92603 | A297, A608 | 0.35 | 19 to 23 | 9 to 12 | 2.00 |
| HH | 70309 | J93503 | A297, A608 | 0.35 | 24 to 28 | 11 to 14 | 2.00 |
| HI | J94003 | A297, A567, A608 | 0.35 | 28 to 32 | 18 to 22 | 2.00 | |
| HK | 70310 | J94224 | A297, A351, A567, A608 | 0.35 | 24 to 28 | 18 to 22 | 2.00 |
| HL | J94604 | A297, A608 | 0.35 | 28 to 32 | 18 to 22 | 2.00 | |
| HN | 70311 | J94213 | A297, A608 | 0.35 | 19 to 23 | 23 to 27 | 2.00 |
| HP | - | A297 | 0.35 | 24 to 28 | 33 to 37 | 2.00 | |
| HP-50WZ(c) | - | 0.45 | 24 to 28 | 33 to 37 | 2.50 | ||
| HT | 70330 | J94605 | A297, A351, A567, A608 | 0.35 | 13 to 17 | 33 to 37 | 2.50 |
| HU | 70331 | - | A297, A608 | 0.35 | 17 to 21 | 37 to 41 | 2.50 |
| HW | - | A297, A608 | 0.35 | 10 to 14 | 58 to 62 | 2.50 | |
| HX | 70355 | - | A297, A608 | 0.35 | 15 to 19 | 64 to 68 | 2.50 |
a). ASTM Designations are same as ACI Designations.
b). Remaining Fe in all compositions. Manganese content: 0.35 to 0.65% for HA, 1% for HC, 1.5% for HD and 2% for the other alloys. Phosphorous and Sulphur contents: 0.04% for but HP-50WZ, Molybdenum is intentionally added to HA, which has 0.90 to 1.2% Mo; maximum for other alloys is set at 0.5% Mo. HH also contains 2% N max.
c). Also contains 4 to 6% W, 1.0% Zr, and 0.035% max. S and P
