ASTM B472 is the standard specification by ASTM International covering nickel alloy billets and bars for reforging. This specification addresses billets, blooms, and bars intended to be further forged into finished components. It covers a wide range of nickel-chromium-molybdenum, nickel-chromium-iron, and nickel-molybdenum alloys. The companion specification ASME SB-472 adopts identical requirements.
Zhengzhou Huitong (HT Pipe) supplies ASTM B472 / SB-472 compliant nickel alloy billets and bars for reforging with full Mill Test Certificates (MTC) per EN 10204 3.1.
1. Standard Scope & Designation
ASTM B472 covers the following nickel alloy (multiple families) grades:
| UNS No. |
Common Name |
Alloy Type |
Key Features & Application |
| UNS N06002 |
Hastelloy X |
Ni-Bal, Cr-20.5-23%, Mo-8-10%, Fe-17-20%, Co-0.5-2.5% |
High-temperature — gas turbine, furnace |
| UNS N06022 |
Hastelloy C22 |
Ni-Bal, Cr-20-22.5%, Mo-12.5-14.5%, W-2.5-3.5% |
Universal corrosion resistance |
| UNS N06030 |
Hastelloy G30 |
Ni-Bal, Cr-28-31%, Mo-4-6%, Fe-13-17%, Co-5% max |
Highly oxidizing acids |
| UNS N06200 |
Hastelloy C2000 |
Ni-Bal, Cr-23%, Mo-16%, Cu-1.6% |
Broad-spectrum chemical resistance |
| UNS N06230 |
Hastelloy W |
Ni-Bal, Cr-20-24%, Mo-12-14%, W-2-6% |
Aerospace and chemical environments |
| UNS N06600 |
Alloy 600 / Inconel 600 |
Ni-72% min, Cr-14-17%, Fe-6-10% |
General high-temperature service |
Scope Statement: "This specification covers nickel alloy billets, blooms, and bars intended for reforging into finished components. It includes multiple nickel-chromium-molybdenum, nickel-chromium-iron, nickel-molybdenum, and nickel-iron-chromium alloys in a wide range of UNS designations."
| Designation |
Issuing Body |
Unit System |
Latest Edition |
| ASTM B472 |
ASTM International |
Inch-Pound |
B472-21 |
| ASME SB-472 |
ASME (BPVC Sec. II Part B) |
Both |
2025 Edition |
2. Alloy Grades Covered by ASTM B472
ASTM B472 covers numerous nickel alloy grades for reforging, selected for their ability to be hot-worked into finished components:
| UNS No. |
Commercial Designation |
Alloy Type |
Key Features & Typical Application |
| UNS N06002 |
Hastelloy X |
Ni-Bal, Cr-20.5-23%, Mo-8-10%, Fe-17-20%, Co-0.5-2.5% |
High-temperature — gas turbine, furnace |
| UNS N06022 |
Hastelloy C22 |
Ni-Bal, Cr-20-22.5%, Mo-12.5-14.5%, W-2.5-3.5% |
Universal corrosion resistance |
| UNS N06030 |
Hastelloy G30 |
Ni-Bal, Cr-28-31%, Mo-4-6%, Fe-13-17%, Co-5% max |
Highly oxidizing acids |
| UNS N06200 |
Hastelloy C2000 |
Ni-Bal, Cr-23%, Mo-16%, Cu-1.6% |
Broad-spectrum chemical resistance |
| UNS N06230 |
Hastelloy W |
Ni-Bal, Cr-20-24%, Mo-12-14%, W-2-6% |
Aerospace and chemical environments |
| UNS N06600 |
Alloy 600 / Inconel 600 |
Ni-72% min, Cr-14-17%, Fe-6-10% |
General high-temperature service |
3. Chemical Composition — Key Grades (ASTM B472)
Values are maximum unless shown as a range. Heat analysis per ASTM B472.
| Grade |
Ni% |
Cr% |
Mo% |
Fe% |
W% |
Co% |
C% |
| N06002 |
Balance |
20.5–23.0 |
8.0–10.0 |
17.0–20.0 |
0.2–1.0 |
0.5–2.5 |
0.05–0.15 |
| N06022 |
Balance |
20.0–22.5 |
12.5–14.5 |
2.0–6.0 |
2.5–3.5 |
2.5 |
0.015 |
| N06030 |
Balance |
28.0–31.0 |
4.0–6.0 |
13.0–17.0 |
1.5–4.0 |
5.0 |
0.05 |
| N06200 |
Balance |
20.0–24.0 |
15.0–17.0 |
3.0 |
— |
2.0 |
0.01 |
| N06230 |
Balance |
20.0–24.0 |
12.0–14.0 |
3.0 |
2.0–6.0 |
3.0 |
0.05–0.15 |
Note: Product analysis tolerances per ASTM B472 apply.
4. Mechanical Property Requirements (ASTM B472)
All values are minimum requirements unless otherwise stated. Tensile testing per ASTM E8.
| Grade |
UNS |
Tensile Strength
min MPa (ksi) |
Yield Strength 0.2%
min MPa (ksi) |
Elong.
min % |
Hardness
max |
| Hastelloy X |
N06002 |
690 (100) |
310 (45) |
35 |
210 HB |
Solution Annealed |
| Hastelloy C22 |
N06022 |
690 (100) |
276 (40) |
40 |
200 HB |
Solution Annealed |
| Hastelloy G30 |
N06030 |
620 (90) |
276 (40) |
40 |
210 HB |
Solution Annealed |
Note: Hardness testing per ASTM E10 (Brinell) or ASTM E18 (Rockwell). Cold-worked bar may exhibit higher strength due to cold work.
5. Heat Treatment Requirements
| Grade |
Condition |
Heat Treatment |
Cooling |
| UNS N06002 (Hastelloy X) |
Solution Annealed |
1149–1204°C (2100–2200°F) |
Water quench or rapid air cool |
| UNS N06022 (Hastelloy C22) |
Solution Annealed |
1040–1120°C (1900–2050°F) |
Water quench |
| UNS N06030 (Hastelloy G30) |
Solution Annealed |
1121–1177°C (2050–2150°F) |
Water quench |
| UNS N06200 (Hastelloy C2000) |
Solution Annealed |
1093–1149°C (2000–2100°F) |
Water quench |
Important: Billets and bars for reforging are supplied in the solution-annealed condition to ensure optimal hot workability during subsequent forging operations. The reforging temperature range varies by alloy but generally falls between 980°C and 1204°C depending on the specific grade. Final heat treatment after reforging should follow the requirements of the appropriate product specification.
6. Testing & Inspection Requirements
| Test |
Requirement |
Reference Standard |
| Chemical Analysis (Heat) |
One per heat / melt; all elements per applicable table |
ASTM E1473 / E354 |
| Macroetch / Micro |
Quality assessment of billet structure |
ASTM E381 / E3 |
| Grain Size |
When specified by purchaser |
ASTM E112 |
| Ultrasonic Testing |
When specified; detection of internal defects |
ASTM E2375 |
| Visual & Dimensional |
Surface condition, size, straightness |
ASTM B472 Tables |
| PMI (Positive Material ID) |
When specified by purchaser |
ASTM E1473 |
7. Rod & Bar Dimensions — Available Sizes
ASTM B472 covers various rod and bar forms. Common commercial size ranges:
| Form |
Diameter / Width |
Typical Length |
Tolerance |
| Billets (Round) |
100 – 500 mm diameter |
1.5 – 4.0 m length |
As-cast / forged tolerances |
| Billets (Square) |
100 – 400 mm side |
1.5 – 4.0 m length |
As-cast / forged tolerances |
| Bloom |
200 – 600 mm |
2.0 – 5.0 m length |
As-forged tolerances |
| Bars for Reforging |
25 – 300 mm diameter |
3.0 – 6.0 m random |
±0.13 mm typical |
Note: Diameter tolerances per ASTM B472 tables. Cut-to-length available on request.
8. Industries & Applications
| Industry |
Recommended Grades |
Typical Applications |
| Aerospace Forgings |
N06002, N06230 |
Turbine discs, compressor wheels, casings, shaft forgings |
| Chemical Vessels |
N06022, N06030, N06200 |
Flanges, nozzles, vessel forgings for aggressive service |
| Oil & Gas |
N06022, N06200 |
Wellhead forgings, manifold components, valve bodies |
| Power Generation |
N06002 |
Gas turbine components, combustion chamber parts |
| Industrial Gas Turbines |
N06002, N06230 |
Transition pieces, turbine shrouds, hot gas path components |
| Pharmaceutical |
N06022 |
High-purity reactor forgings, sanitary fitting blanks |
9. B472 vs B574 vs B166 — Nickel Alloy Specification Families Compared
| Criteria |
ASTM B472 |
ASTM B574 |
ASTM B166 |
| Product Form |
Billets, Bars for Reforging |
Rod, Bar (finished) |
Rod, Bar, Shapes |
| Intended Use |
Further forging / hot working |
Direct machining / use |
Direct machining / use |
| Key Grades |
N06002, N06022, N06030, N06200 |
N10276, N06022, N06030 |
N06600, N06601, N06690 |
| Heat Treatment |
Solution annealed for workability |
Condition per product spec |
Annealed per requirements |
| Quality Testing |
Macroetch, UT, grain size |
Tensile, hardness, corrosion |
Tensile, hardness, corrosion |
| Primary Application |
Forged components supply |
Finished bars & rods |
Machined parts, fasteners |
Key Distinction: ASTM B472 specifically covers billets, blooms, and bars intended for further reforging into finished components. The chemical composition requirements are identical to those in the corresponding finished product specifications (e.g., B574, B166), but the mechanical property requirements may differ because the material will undergo additional hot working during the reforging process.
10. Related Standards
| Standard |
Scope |
Relationship |
| ASTM B574 |
Ni-Mo-Cr Alloy Rod, Bar |
Finished rod/bar companion specification |
| ASTM B166 |
Ni-Cr-Fe Alloy Rod, Bar |
Finished rod/bar companion specification |
| ASTM B564 |
Ni Alloy Forgings |
Forged component specification |
| ASTM B880 |
General Requirements for Nickel Alloys |
Governs tolerances, testing, certification |
| ASTM E381 |
Macroetch Testing of Steel |
Billet quality assessment |
| ASTM E2375 |
Ultrasonic Testing |
Internal defect detection |
| ASME SB-472 |
BPVC Section II Part B |
ASME adoption with CMTR |
| DIN EN 10204 |
Metallic Products — Inspection Documents |
3.1 CMTR certification |
11. How to Order — Required Information
| No. |
Item |
Requirement / Example |
| 1 |
Specification |
ASTM B472 / ASME SB472 |
| 2 |
Grade / UNS |
e.g., UNS N06022 (Hastelloy C22) or UNS N06002 (Hastelloy X) |
| 3 |
Shape |
Round Billet, Square Billet, Bloom, Bar for Reforging |
| 4 |
Processing |
As-cast or As-forged (for reforging) |
| 5 |
Diameter / Size |
e.g., 50 mm round |
| 6 |
Length |
Random (RL ~3–6 m) or Cut-to-length |
| 7 |
Condition |
Solution Annealed (default) |
| 8 |
Supplementary Tests |
PMI, intergranular corrosion, UT, impact testing |
| 9 |
Certification |
EN 10204 3.1 Certified Mill Test Report |
| 10 |
Quantity |
Pieces or total weight (kg / metric tons) |
12. Frequently Asked Questions
Q: What is ASTM B472 nickel alloy billet?
ASTM B472 is the standard specification for nickel alloy billets, blooms, and bars intended for reforging. It covers a wide range of nickel-chromium-molybdenum, nickel-chromium-iron, nickel-molybdenum, and nickel-iron-chromium alloys in multiple UNS designations. These billets are supplied for further hot working into finished forged components.
Q: What grades are covered by ASTM B472?
ASTM B472 covers numerous nickel alloy grades including UNS N06002 (Hastelloy X), UNS N06022 (Hastelloy C22), UNS N06030 (Hastelloy G30), UNS N06200 (Hastelloy C2000), UNS N06230 (Hastelloy W), UNS N06600 (Alloy 600), UNS N06617 (Alloy 617), UNS N08800 (Alloy 800), and many others.
Q: What is the difference between ASTM B472 and ASTM B574?
ASTM B472 covers billets, blooms, and bars intended for further reforging into finished components. ASTM B574 covers finished nickel-molybdenum-chromium alloy rod and bar for direct use or machining. B472 billets are typically supplied in larger sizes with less stringent dimensional tolerances, as they will undergo additional hot working.
Q: What are the quality requirements for B472 billets?
ASTM B472 billets undergo chemical analysis per heat, macroetch examination for structural quality, and may include ultrasonic testing, grain size measurement, and positive material identification when specified. The material is supplied in the solution-annealed condition for optimal subsequent forgeability.
Q: What is UNS N06022 (Hastelloy C22) used for?
Hastelloy C22 is one of the most versatile nickel alloys, offering outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing chemical environments. B472 billets of C22 are used to forge flanges, nozzles, valve bodies, and other pressure-containing components.
Q: Is ASTM B472 the same as ASME SB-472?
Technically identical in chemical composition requirements. ASME SB-472 is ASTM B472 adopted into ASME BPVC Section II Part B. SB-472 additionally requires Certified Material Test Reports (CMTR) with full traceability for ASME Code-stamped forged components.
Request a Quote — ASTM B472 Nickel Alloy Billets & Bars for Reforging
Zhengzhou Huitong (HT Pipe) supplies ASTM B472 / SB-472 compliant nickel alloy billets and bars for reforging in UNS N06002, N06022, N06030, N06200, N06230, N06600, and other grades. Full EN 10204 3.1 CMTRs and competitive lead times from affiliated mills.
