ASTM B805 is the ASTM standard specification that governs precipitation-hardenable Incoloy 925 (UNS N09925) bar, billet and forgings for nuclear and general industrial use. It defines the limiting chemical composition, mandatory heat-treatment condition, mechanical property minimums (UTS, YS, elongation, RA, hardness), permitted dimensional tolerances, marking and certification requirements. ASTM B805 is the most-cited bar/forging specification on Incoloy 925 MTCs alongside API 6A (wellhead service) and NACE MR0175 / ISO 15156-3 (sour service). TorqBolt manufactures Incoloy 925 bar and forgings to ASTM B805 with EN 10204 3.1 (manufacturer's) MTC documenting actual heat-lot chemistry, mechanical results and heat-treatment cycle, 3.2 third-party witnessed certification on request.
Need ASTM B805 Incoloy 925 bar / forgings? Email info@torqbolt.com with size, quantity and any companion-spec requirements (API 6A PSL level, NACE MR0175 stamp, NORSOK MDS, ASME III nuclear code stamp). WhatsApp +91-22-66157017.
Scope of ASTM B805
ASTM B805 covers wrought UNS N09925 in the following product forms:
- Round bar, hot-rolled, hot-forged or cold-drawn; 6 mm to 350 mm diameter
- Flat / square / hexagonal bar, hot-rolled or cold-finished
- Forging stock, cut bar/billet for further open-die or closed-die forging
- Forgings, finished hot-forged components per customer drawing
Companion ASTM specifications: ASTM B983 covers sheet, plate and strip; ASTM B829 is the general requirements specification for wrought nickel-alloy pipe; ASTM B564 covers forged or rolled fittings (UNS N09925 not currently included).
Chemical Composition Requirements
ASTM B805 chemistry is identical to Special Metals SMC HA 46. See the full chemical composition page for element-by-element commentary and trademark/UNS naming.
| Element | Min % | Max % | Element | Min % | Max % |
|---|---|---|---|---|---|
| Ni | 42.0 | 46.0 | Mn | 1.0 | |
| Cr | 19.5 | 22.5 | Si | 0.5 | |
| Fe | 22 min | balance | Nb | 0.5 | |
| Mo | 2.5 | 3.5 | C | 0.03 | |
| Cu | 1.5 | 3.0 | S | 0.03 | |
| Ti | 1.9 | 2.4 | P | 0.03 | |
| Al | 0.1 | 0.5 |
Product analysis: The producer's heat (ladle) analysis is reported on the MTC. Product (check) analysis on the finished bar may be requested by the purchaser; permissible variation between ladle and product analysis is given in ASTM E1473 Table 1.
Mechanical Property Requirements (Annealed + Aged)
| Property | ASTM B805 Minimum | Test Method |
|---|---|---|
| Tensile Strength | 165 ksi (1140 MPa) | ASTM E8 / E8M |
| 0.2% Yield Strength | 110 ksi (760 MPa) | ASTM E8 / E8M |
| Elongation in 4D | 18% | ASTM E8 / E8M |
| Reduction of Area | 25% | ASTM E8 / E8M |
| Hardness (max) | 35 HRC | ASTM E18 |
Charpy V-notch impact testing is not mandatory under ASTM B805 but is required by companion specifications: API 6A requires 27 J min at -29°C (PSL 3) or -46°C (PSL 3G); NACE MR0175 typically requires 40 J at -46°C for sour service. See the full mechanical properties page for elevated-temperature data and Charpy envelope.
Mandatory Heat-Treatment Condition
ASTM B805 requires the alloy to be supplied in the SOLUTION-ANNEALED AND AGED (Class A) condition. The standard cycle:
- Solution Anneal: 1900±25°F (1040±14°C), 1 h per 1" of section thickness, water quench
- Age (Step 1): 1365°F (740°C), 8 hours, furnace cool 100°F/h to 1150°F
- Age (Step 2): 1150°F (621°C), 8 hours, air cool
Furnace pyrometry per AMS 2750 is required. Charge thermocouple traceability and chart-recorder traces must be retained for 5 years ASTM B805 Section 7. See the full heat-treatment page for cycle rationale and process control.
Required Testing
| Test | Method | Frequency |
|---|---|---|
| Chemistry (heat analysis) | ASTM E1473 | Each heat |
| Tensile | ASTM E8 / E8M | One test per heat per heat-treatment lot |
| Hardness | ASTM E18 | One test per piece (100% inspection) |
| Grain size (if specified) | ASTM E112 | One test per heat, ASTM 5 or finer |
| Liquid penetrant (S5 surface) | ASTM E165 | If purchaser-required; 100% surface |
| Ultrasonic (S6 volume) | ASTM E2375 | If purchaser-required; 100% volume |
Marking & Certification
Per ASTM B805 Section 16, each piece (bar or forging) must be marked with:
- Specification number: ASTM B805
- UNS designation: N09925
- Heat number
- Manufacturer's identification
- Heat-treatment condition (Annealed + Aged)
- Size (diameter / dimensions)
Marking is by stamping (low-stress die), tagging or paint stencil. The MTC accompanying the shipment must reference all of the above plus chemistry, mechanical results and heat-treatment cycle. EN 10204 3.1 (manufacturer's) certificate is the default; 3.2 (third-party witnessed) on request.
Companion-Specification Compliance
| Companion Standard | Additional Requirements vs ASTM B805 |
|---|---|
| API 6A Wellhead Bolting | PSL-1/2/3/3G/4 specific Charpy temperature; CRA classification 4d; furnace charts retained per Annex M |
| NACE MR0175 / ISO 15156 | 35 HRC max in CW+aged; sour-service stamping; optional NACE TM0177 / TM0316 test data |
| NORSOK M-630 MDS A30 | Norwegian certification body acceptance; optional CTOD or HISC test data |
| ASME III Nuclear Code | Code stamping by ASME-certified manufacturer; ASME Section II Part B coverage |
| EN 10204 3.2 | Third-party inspection witness on tensile / hardness / heat-treatment cycle |
Available Product Forms (TorqBolt)
| Form | Size Range | Application |
|---|---|---|
| Round bar | 8 mm to 350 mm dia | Stock for stud bolts, hex bolts, machined parts |
| Hex bar | 1/4" AF to 2" AF | Hex bolt and nut blanks |
| Forging stock (cut billet) | 50 mm to 500 mm | For further closed-die forging |
| Open-die forgings | customer drawing | Hangers, valve bodies, pressure vessels |
| Finished stud bolts | 1/4" to 4" | API 6A wellhead, sour-service flange bolting |
| Heavy hex nuts | M6 to M64 | Companion to stud bolts |
Frequently Asked Questions
What is the difference between ASTM B805 and ASTM B983? Both cover UNS N09925 with identical chemistry and mechanical-property requirements. ASTM B805 covers bar and forgings; ASTM B983 covers sheet, plate and strip. The mechanical-property minimums (165 ksi UTS / 110 ksi YS in aged condition) are identical between the two standards.
Is hardness testing performed on every bar? Yes, ASTM B805 Section 8 mandates hardness as 100% inspection (every piece tested), while tensile testing is sample-based (one test per heat per heat-treatment lot). This is because hardness is the key sour-service acceptance criterion (35 HRC max per NACE MR0175) and must be verified on every piece.
Can ASTM B805 material be supplied in solution-annealed-only condition? Yes by purchaser request, but the standard's mechanical-property minimums (165 ksi UTS, 110 ksi YS) apply only to the aged condition. Annealed-only material is supplied at ~110 ksi UTS / ~50 ksi YS; the MTC must clearly state "solution annealed only, not aged" and the customer is responsible for the final age cycle.
What is the typical lead time for ASTM B805 bar? Standard sizes (12 mm to 100 mm round bar): 4–6 weeks ex-stock or 8–10 weeks new-melt. Larger sizes and forgings: 12–16 weeks. The bottleneck is the 18-hour age cycle in calibrated furnaces.
Request a Quote
For ASTM B805 Incoloy 925 bar and forgings with full MTC:
- Email: info@torqbolt.com
- WhatsApp: +91-22-66157017
- Datasheet PDF + sample MTC available on request
Specify size, quantity, condition (annealed or aged), companion-specification requirements (API 6A PSL level, NACE MR0175 stamp, NORSOK MDS, ASME III nuclear code), required NDE (PT / UT / RT), MTC type (3.1 or 3.2 with TPI witness), and any product-form preference (round / hex / forged).
References: ASTM B805 Standard Specification for Forgings and Forging Stock for Nuclear and General Use Wrought Precipitation Hardened UNS N09925 (latest edition). Special Metals Corporation: INCOLOY® alloy 925 Technical Bulletin, Tables 1, 6, 7. ASTM E8 / E18 / E112 / E1473 / E165 / E2375 referenced test methods. AMS 2750 Pyrometry. EN 10204 Inspection Documents. INCOLOY® is a registered trademark of Special Metals Corporation.
