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Alloy 30 (UNS N06030) Butt Weld Fittings, Plate and Bar
Alloy 30 (UNS N06030) is a nickel-chromium-iron-molybdenum-copper alloy supplied as butt weld fittings to ASME SB-366 and B16.9, plate, sheet and strip to SB-582, and welded tube to SB-626. It is the general-purpose member of the Hastelloy G family, combining broad acid resistance with good fabricating formability.
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Alloy 30, often referenced as Hastelloy G-30, belongs to the nickel-chromium-iron-molybdenum-copper family that includes Alloy G (UNS N06007) and Alloy G-3 (UNS N06985). This family was developed to give stainless-class handling of the common reducing acids — sulphuric, hydrochloric, phosphoric — with the addition of copper for improved resistance to non-oxidising acids, at a lower alloy cost than the pure nickel-molybdenum C series.
Specification Coverage
| Product Form | ASME Specification | UNS Designation |
|---|---|---|
| Wrought butt weld fittings | SB-366 (ASME B16.9 dimensions) | N06030 |
| Plate, sheet and strip | SB-582 | N06030 |
| Welded tube | SB-626 | N06030 |
| Forged flanges | SB-462 | N06030 |
| Bar and forging stock | SB-574 / SB-564 | N06030 |
ASME SB-366 Table 2 lists N06030 under the WP designation WPHG30, confirming the wrought route. Alloy 30 is also listed in ASME SB-582 Table 1 and ASME SB-626 Table 1 for plate and welded tube respectively.
Grade Comparison Within the G Family
| Grade | UNS | Cr | Mo | Cu | Position in Family |
|---|---|---|---|---|---|
| Alloy G | N06007 | 21.0–23.5 | 5.5–7.5 | 1.5–2.5 | Original general acid grade |
| Alloy 30 (G-30) | N06030 | 21.0–23.5 | 5.5–7.5 | 1.5–2.5 | Lower carbon, tighter control |
| Alloy G-3 | N06985 | 21.0–23.5 | 5.5–7.5 | 1.5–2.5 | Higher strength variant |
| Alloy C-276 | N10276 | 16.0–18.0 | 15.0–17.0 | — | Molybdenum-dominant, broader envelope |
The G family shares the same nominal Cr-Mo-Cu envelope; the grades differ mainly in carbon control, mechanical properties and specific test requirements. Alloy 30 is generally chosen when a moderate molybdenum level is sufficient and full C-276 performance is not required, giving better availability and cost.
Chemical Composition
Per ASME SB-582 Table 1 for the Ni-Cr-Fe-Mo-Cu family including N06030:
| Element | Composition Limit, % |
|---|---|
| Nickel | remainder |
| Chromium | 21.0–23.5 |
| Iron | 18.0–21.0 |
| Molybdenum | 5.5–7.5 |
| Copper | 1.5–2.5 |
| Manganese | 1.0–2.0 |
| Cobalt | 2.5 max |
| Carbon | 0.05 max |
| Tungsten | 1.0 max |
| Silicon | 1.0 max |
| Phosphorus | 0.04 max |
| Sulfur | 0.03 max |
Note that the family specification covers UNS N06007, N06975, N06985 and N06030. Where a specific grade requires an element limit tighter than the family value — for example niobium plus tantalum addition control — that will appear on your certificate of conformity. Please send us the exact grade and product form so we can confirm the applicable column.
Heat Treatment
| Alloy Designation | UNS | Solution Treatment °F [°C] | Quench | Footnote |
|---|---|---|---|---|
| WPHG30 | N06030 | 2150 [1177] | Rapid Air/Water | D |
Footnote D on the solution treatment temperature indicates the minimum temperature applicable to this grade in ASME SB-366 Table 3.
Fitting Dimensions and Classes
| Parameter | Standard | Range |
|---|---|---|
| Fitting dimensions | ASME B16.9 | NPS 1/2 in. to NPS 24 in. (confirm above NPS 12 in.) |
| Wall thickness | ASME B16.9 | Schedules 5S to 160, or customer-specified |
| End preparation | ASME B16.25 | Plain, bevelled or customer drawing |
| Plate thickness | SB-582 Table 2 | Minimum 3/16 in. (4.76 mm); yield 85 ksi minimum for N06030 |
| Heat treatment | SB-366 Table 3 | Solution annealed, rapid air or water quench |
ASME SB-582 Table 2 sets the minimum thickness and yield strength for N06030 plate. For material 3/16 in. (4.76 mm) and over in thickness, the minimum yield strength for N06030 is 85 ksi. For thickness under 3/16 in. the plate is supplied as sheet or strip under the same specification.
Applications
- Sulphuric and hydrochloric acid handling systems
- Phosphoric acid and fertiliser production equipment
- Pickling lines and acid regeneration plants
- Pulp and paper chemical recovery
- Marine and offshore seawater handling where Mo/Cu balance suits the duty
- General chemical process piping where full C-series alloys are not economical
Inspection and Testing
- EN 10204 3.1 certification, 3.2 available on request
- Solution annealing per SB-366 Table 3 with heat-treatment charts
- Intercrystalline corrosion testing to ASTM G28 where specified
- Positive material identification (PMI) with XRF on every fitting
- Dye penetrant inspection on request
- Radiographic or ultrasonic weld examination where WP Class W, WX or WU is ordered
- Full traceability to heat number, with mill test certificates supplied
Ordering Information
Please include:
- Product form — butt weld fitting, forged flange, plate, sheet or bar
- Grade — Alloy 30 / UNS N06030, or Alloy G / N06007 if you are substituting
- Specification — ASME SB-366 for fittings, SB-582 for plate, SB-462 for flanges
- Nominal size, schedule or wall thickness, and pressure class
- End preparation and any dimensional tolerances beyond B16.9
- Certification level — EN 10204 3.1 or 3.2
- Any NACE MR0175 / MR0103 or PED documentation requirements
Send your requirement to our team and we will quote against the exact specification you name.
