ASTM B574/B574M is the standard specification by ASTM International covering low-carbon nickel-molybdenum-chromium alloys in the form of hot-finished and cold-finished rod and bar. The most widely used grades are UNS N10276 (Hastelloy C276) and UNS N06022 (Hastelloy C22). The companion specification ASME SB-574 adopts identical requirements.
Zhengzhou Huitong (HT Pipe) supplies ASTM B574 / SB-574 compliant nickel-molybdenum-chromium alloy rods and bars with full Mill Test Certificates (MTC) per EN 10204 3.1.
1. Standard Scope & Designation
ASTM B574 covers the following ni-mo-cr (low carbon) grades:
| UNS No. |
Common Name |
Alloy Type |
Key Features & Application |
| UNS N10276 |
Hastelloy C276 |
Ni-Bal, Cr-14.5-16.5%, Mo-15-17%, W-3-4.5%, C-0.01% max |
Universal corrosion — chemical, FGD, offshore |
| UNS N06022 |
Hastelloy C22 |
Ni-Bal, Cr-20-22.5%, Mo-12.5-14.5%, W-2.5-3.5% |
Oxidizing + reducing environments |
| UNS N06035 |
Hastelloy G35 |
Ni-Bal, Cr-19-21%, Mo-7-9%, Cu-0.5-1.5% |
Phosphoric and sulfuric acid service |
| UNS N06059 |
Hastelloy C59 |
Ni-Bal, Cr-22-24%, Mo-15-16.5% |
Weldability with oxidizing acid resistance |
| UNS N06455 |
Hastelloy C4 |
Ni-Bal, Cr-14-18%, Mo-14-17% |
Thermal stability — high-temp processing |
| UNS N06686 |
Inconel 686 |
Ni-Bal, Cr-19-23%, Mo-15-17%, W-3-4.4% |
Weld overlay and aggressive chemical |
Scope Statement: "This specification covers low-carbon nickel-molybdenum-chromium, nickel-molybdenum-chromium-tungsten, and nickel-chromium-molybdenum alloys in the form of hot-finished and cold-finished rounds, squares, and hexagons for corrosive service environments."
| Designation |
Issuing Body |
Unit System |
Latest Edition |
| ASTM B574 |
ASTM International |
Inch-Pound |
B574/B574M-21 |
| ASTM B574M |
ASTM International |
SI (Metric) |
B574/B574M-21 |
| ASME SB-574 |
ASME (BPVC Sec. II Part B) |
Both |
2025 Edition |
2. Alloy Grades Covered by ASTM B574
ASTM B574 covers low-carbon nickel-molybdenum-chromium alloys designed for the most demanding corrosive environments:
| UNS No. |
Commercial Designation |
Alloy Type |
Key Features & Typical Application |
| UNS N10276 |
Hastelloy C276 |
Ni-Bal, Cr-14.5-16.5%, Mo-15-17%, W-3-4.5%, C-0.01% max |
Universal corrosion — chemical, FGD, offshore |
| UNS N06022 |
Hastelloy C22 |
Ni-Bal, Cr-20-22.5%, Mo-12.5-14.5%, W-2.5-3.5% |
Oxidizing + reducing environments |
| UNS N06035 |
Hastelloy G35 |
Ni-Bal, Cr-19-21%, Mo-7-9%, Cu-0.5-1.5% |
Phosphoric and sulfuric acid service |
| UNS N06059 |
Hastelloy C59 |
Ni-Bal, Cr-22-24%, Mo-15-16.5% |
Weldability with oxidizing acid resistance |
| UNS N06455 |
Hastelloy C4 |
Ni-Bal, Cr-14-18%, Mo-14-17% |
Thermal stability — high-temp processing |
| UNS N06686 |
Inconel 686 |
Ni-Bal, Cr-19-23%, Mo-15-17%, W-3-4.4% |
Weld overlay and aggressive chemical |
3. Chemical Composition — Key Grades (ASTM B574)
Values are maximum unless shown as a range. Heat analysis per ASTM B574.
| Grade |
Ni% |
Cr% |
Mo% |
W% |
C% |
Fe% |
Mn% |
Si% |
| N10276 |
Balance |
14.5–16.5 |
15.0–17.0 |
3.0–4.5 |
0.01 |
4.0–7.0 |
1.00 |
0.08 |
| N06022 |
Balance |
20.0–22.5 |
12.5–14.5 |
2.5–3.5 |
0.015 |
2.0–6.0 |
0.50 |
0.08 |
| N06059 |
Balance |
22.0–24.0 |
15.0–16.5 |
— |
0.01 |
1.5 |
1.00 |
0.10 |
| N06455 |
Balance |
14.0–18.0 |
14.0–17.0 |
— |
0.015 |
3.0 |
1.00 |
0.08 |
Note: Product analysis tolerances per ASTM B574 apply.
4. Mechanical Property Requirements (ASTM B574)
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 C276 |
N10276 |
690 (100) |
283 (41) |
40 |
210 HB |
Solution Annealed |
| Hastelloy C22 |
N06022 |
690 (100) |
276 (40) |
40 |
200 HB |
Solution Annealed |
| Hastelloy C59 |
N06059 |
690 (100) |
310 (45) |
40 |
220 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 N10276 (Hastelloy C276) |
Solution Annealed |
1066–1121°C (1950–2050°F) |
Water quench |
| UNS N06022 (Hastelloy C22) |
Solution Annealed |
1040–1120°C (1900–2050°F) |
Water quench |
| UNS N06059 (Hastelloy C59) |
Solution Annealed |
1093–1149°C (2000–2100°F) |
Water quench |
| UNS N06455 (Hastelloy C4) |
Solution Annealed |
1040–1120°C (1900–2050°F) |
Water quench |
Important: All grades covered by ASTM B574 are low-carbon alloys (≤0.01–0.015% C) that require solution annealing followed by rapid water quenching. This is critical to dissolve any precipitated phases and ensure maximum corrosion resistance. Hastelloy C276 is one of the few alloys resistant to wet chlorine gas, hypochlorite, and chlorine dioxide solutions.
6. Testing & Inspection Requirements
| Test |
Requirement |
Reference Standard |
| Chemical Analysis (Heat) |
One per heat / melt; all elements per Table 1 |
ASTM E1473 / E354 |
| Tensile Test |
One per lot (same heat, same condition, same diameter group) |
ASTM E8 / E8M |
| Hardness Test |
Brinell or Rockwell; one per lot |
ASTM E10 / E18 |
| Intergranular Corrosion |
Required; ASTM G28 Method A |
ASTM G28 |
| Visual & Dimensional |
Surface condition, straightness, diameter tolerance |
ASTM B574 Tables |
| PMI (Positive Material ID) |
When specified by purchaser |
ASTM E1473 |
7. Rod & Bar Dimensions — Available Sizes
ASTM B574 covers various rod and bar forms. Common commercial size ranges:
| Form |
Diameter / Width |
Typical Length |
Tolerance |
| Hot-Finished Round |
12.7 – 200 mm (1/2–8 in.) |
3.0 – 6.0 m random |
±0.13 mm typical |
| Cold-Finished Round |
6.35 – 100 mm (1/4–4 in.) |
3.0 – 6.0 m random |
±0.05 mm typical |
| Hot-Finished Square |
12.7 – 150 mm |
3.0 – 6.0 m random |
±0.25 mm typical |
| Hot-Finished Hexagon |
12.7 – 100 mm (AF) |
3.0 – 6.0 m random |
±0.25 mm typical |
Note: Diameter tolerances per ASTM B574 tables. Cut-to-length available on request.
8. Industries & Applications
| Industry |
Recommended Grades |
Typical Applications |
| Chemical Processing |
N10276, N06022, N06059 |
Reactors, heat exchangers, scrubbers, agitators |
| Flue Gas Desulfurization |
N10276, N06022 |
FGD absorber internals, ductwork, stack liners |
| Oil & Gas |
N10276, N06022 |
Downhole tubing, manifolds, Christmas trees, HPHT service |
| Pharmaceutical |
N10276, N06022 |
Reactors, piping, high-purity corrosion service |
| Pulp & Paper |
N10276 |
Digester components, bleach plant equipment |
| Waste Treatment |
N10276, N06059 |
Hazardous waste incineration, flue gas systems |
9. B574 vs B575 vs B622 — Ni-Mo-Cr Alloy Specifications Compared
| Criteria |
ASTM B574 |
ASTM B575 |
ASTM B622 |
| Product Form |
Rod, Bar |
Plate, Sheet, Strip |
Plate, Sheet, Strip (alt.) |
| Key Grades |
N10276, N06022, N06059, N06455 |
N10276, N06022, N06059 |
N08925, N08024, N08026 |
| Mechanical Props |
TS≥690 MPa (C276) |
TS≥690 MPa (C276) |
TS≥650 MPa (N08925) |
| Corrosion Focus |
Universal, pitting, crevice |
Universal, pitting, crevice |
Seawater, chlorides, acids |
| Heat Treatment |
Solution anneal + WQ |
Solution anneal + WQ |
Solution anneal + WQ |
| Primary Use |
Machined parts, fasteners, shafts |
Pressure vessels, liners |
General corrosion equipment |
Key Distinction: ASTM B574 covers nickel-molybdenum-chromium alloy rod and bar for direct machining or further processing. ASTM B575 covers the same alloy family in plate, sheet, and strip form. ASTM B622 covers similar super-austenistic nickel alloys in plate and sheet. All require solution annealing for optimal corrosion resistance.
10. Related Standards
| Standard |
Scope |
Relationship |
| ASTM B575 |
Ni-Mo-Cr Alloy Plate, Sheet, Strip |
Flat product companion specification |
| ASTM B619 |
Ni-Mo-Cr Alloy Welded Pipe & Tube |
Welded tubular companion |
| ASTM B622 |
Ni Alloy Plate, Sheet, Strip |
Super-austenitic flat products |
| ASTM B880 |
General Requirements for Nickel Alloys |
Governs tolerances, testing, certification |
| ASTM E8 / E8M |
Tension Testing of Metallic Materials |
Tensile test method required by B574 |
| ASTM G28 |
Intergranular Corrosion Testing for Ni Alloys |
Required corrosion test |
| ASME SB-574 |
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 B574 / ASME SB574 |
| 2 |
Grade / UNS |
e.g., UNS N10276 (Hastelloy C276) or UNS N06022 (Hastelloy C22) |
| 3 |
Shape |
Round, Square, Hexagon |
| 4 |
Processing |
Hot-finished (HF) or Cold-finished (CF) |
| 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) |
Download ASTM B574/B574M Standard (PDF)
The official ASTM B574/B574M-21 PDF is available from our HT Pipe Download Center. The document includes full chemical composition, mechanical property requirements, heat treatment, dimensions and tolerances, testing methods, and supplementary requirements.
Go to Download Center | Request MTC / Quotation
12. Frequently Asked Questions
Q: What is ASTM B574 nickel-molybdenum-chromium alloy rod?
ASTM B574/B574M is the standard specification for low-carbon nickel-molybdenum-chromium alloys in the form of hot-finished and cold-finished rod and bar. It covers UNS N10276 (Hastelloy C276), UNS N06022 (Hastelloy C22), UNS N06059 (Hastelloy C59), UNS N06035 (Hastelloy G35), UNS N06455 (Hastelloy C4), and UNS N06686 (Alloy 686).
Q: What is Hastelloy C276 (UNS N10276)?
Hastelloy C276 (UNS N10276) is a nickel-molybdenum-chromium alloy with tungsten addition. It is one of the most versatile corrosion-resistant alloys, with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing environments. It resists wet chlorine, hypochlorite, oxidizing acids, and ferric/chloride solutions.
Q: What are the mechanical properties of Hastelloy C276 rod per ASTM B574?
In the solution-annealed condition, UNS N10276 (Hastelloy C276) rod must meet: minimum tensile strength 690 MPa (100 ksi), minimum yield strength 283 MPa (41 ksi), and minimum elongation 40%. Hardness maximum is 210 HB.
Q: What is the difference between Hastelloy C276 and C22?
Hastelloy C276 (N10276) has 14.5–16.5% Cr and 15–17% Mo with 3–4.5% W. Hastelloy C22 (N06022) has higher chromium (20–22.5%) with lower molybdenum (12.5–14.5%) and lower tungsten (2.5–3.5%). C22 offers better resistance to oxidizing environments and superior weldability, while C276 provides better resistance to localized corrosion in reducing conditions.
Q: What is the difference between ASTM B574 and ASTM B575?
ASTM B574 covers nickel-molybdenum-chromium alloy rod and bar. ASTM B575 covers the same alloy family in plate, sheet, and strip form. Both share the same UNS grades and similar chemical and mechanical requirements.
Q: Is ASTM B574 the same as ASME SB-574?
Technically identical in chemistry and mechanical properties. ASME SB-574 is ASTM B574 adopted into ASME BPVC Section II Part B. SB-574 additionally requires Certified Material Test Reports (CMTR) for ASME Code-stamped equipment. Most mills supply dual-certified B574/SB-574 material.
Request a Quote — ASTM B574 Ni-Mo-Cr Alloy Rod & Bar
Zhengzhou Huitong (HT Pipe) supplies ASTM B574 / SB-574 compliant nickel-molybdenum-chromium alloy rods and bars in UNS N10276 (Hastelloy C276), UNS N06022 (Hastelloy C22), UNS N06059 (Hastelloy C59), and other grades. Full EN 10204 3.1 CMTRs and competitive lead times from affiliated mills.
