Stainless Steel 302HQ CW 1/2H
Supply condition
AISI/SAE 302HQ · UNS S30430
CW 1/2H = cold Worked 1/2-Hard
For rivets, springs-like parts and shafts needing strength; heading capability is largely lost.
Values for the CW 1/2H condition
Other 302HQ tempers and conditions
302HQ is listed in 4 conditions; see the grade overview at 302HQ.
- Annealed
- Cold Drawn
- CW 1/4H
- CW 1/2H
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
solution annealed cold-heading quality (CHQ) wire/rod | Choose for the most severe multi-station cold heading, deep recessed heads and thread rolling where maximum ductility is needed. | 230 | 520 | 55 | 140 HB | — |
Cold DrawnDefault light-to-moderate cold drawn wire/bar (as-drawn) | Default stock condition: cold-drawn coil/bar with higher strength and good surface, still headable for moderate upsets. | 400 | 620 | 28 | 185 HB | — |
Cold Worked 1/4-Hard | Use when a modest strength increase is wanted but partial upsetting or bending is still required. | 550 | 760 | 18 | 22 HRC | 2.4 % IACS |
CW 1/2HThis page Cold Worked 1/2-Hard | For rivets, springs-like parts and shafts needing strength; heading capability is largely lost. | 720 | 930 | 10 | 30 HRC | 2.4 % IACS |
What is 302HQ CW 1/2H?
302HQ CW 1/2H is 302HQ supplied in the CW 1/2H condition — for rivets, springs-like parts and shafts needing strength; heading capability is largely lost. 302HQ CW 1/2H has a yield strength of 720 MPa (104 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 193 GPa (28 Msi). 302HQ CW 1/2H has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,398°C (2,548 °F). Cold Drawn is the default condition FabDigit quotes; CW 1/2H is available on request or by drawing note.
Advantages
- High strength — 720 MPa (104 ksi), better than 93% of stainless steel grades
- Easy to machine — 52/100, better than 91% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
302HQ CW 1/2H properties
Typical room-temperature values for 302HQ CW 1/2H; 24 are specific to this condition. Other listed values are 302HQ reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
302HQ CW 1/2H has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,398°C (2,548 °F).
Mechanical14
302HQ CW 1/2H has a yield strength of 720 MPa (104 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
302HQ CW 1/2H is rated for continuous service to 300°C (572 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 17.3 µm/m·K (9.61 µin/in·°F).
Electrical3
302HQ CW 1/2H conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of 302HQ CW 1/2H takes about 53 MJ of energy and emits 4.9 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
302HQ CW 1/2H's machinability is fair (52/100, better than 91% of stainless steel grades); weldability good (58/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 302HQ CW 1/2H
Is 302HQ easy to machine?
Gummy and work-hardening like 304 (≈45 % of AISI 1212): use positive rake carbide, rigid setups, heavy flood coolant and avoid dwelling; not a free-machining grade.
Can 302HQ be welded?
Weldable by GTAW/resistance methods with 308L or 309L filler, but the Cu-bearing, near-zero-ferrite weld metal is hot-crack sensitive — keep heat input low and avoid autogenous welds on restrained joints.
Can 302HQ be formed, bent or molded?
Best-in-class cold headability among 18-8 grades: multi-station heading, deep recess punching and thread rolling in the annealed condition with chlorinated or synthetic heading lube.
What surface finishes work on 302HQ?
Passivate per ASTM A967 (nitric or citric) after forming; electropolish or barrel-polish for bright fasteners; not anodizable and Cu smut must be pickled off before plating.
302HQ chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C0.08 max in some wire specs | ≤ 0.1 | 0.06 |
| Mn | ≤ 2 | 1.2 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.05 | — |
| S | ≤ 0.03 | — |
| Cr | 17 – 19 | 18 |
| Ni | 8 – 10 | 9.2 |
| Cukey addition: lowers work-hardening rate for cold heading | 3 – 4 | 3.4 |
| Fe | balance | — |
302HQ CW 1/2H — frequently asked
What is 302HQ CW 1/2H used for?
302HQ CW 1/2H is typically used for fasteners, screws and rivets. In short: cold-heading fastener stainless.
What is the yield strength of 302HQ CW 1/2H?
302HQ CW 1/2H has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 93% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 302HQ CW 1/2H easy to machine?
Reasonably — machinability is rated fair (52/100, better than 91% of stainless steel grades). Gummy and work-hardening like 304 (≈45 % of AISI 1212): use positive rake carbide, rigid setups, heavy flood coolant and avoid dwelling; not a free-machining grade.
Can 302HQ CW 1/2H be welded?
Yes — weldability is rated good (58/100). Weldable by GTAW/resistance methods with 308L or 309L filler, but the Cu-bearing, near-zero-ferrite weld metal is hot-crack sensitive — keep heat input low and avoid autogenous welds on restrained joints.
What surface finishes work on 302HQ CW 1/2H?
Passivate per ASTM A967 (nitric or citric) after forming; electropolish or barrel-polish for bright fasteners; not anodizable and Cu smut must be pickled off before plating.
Can 302HQ CW 1/2H be formed, bent or molded?
Best-in-class cold headability among 18-8 grades: multi-station heading, deep recess punching and thread rolling in the annealed condition with chlorinated or synthetic heading lube.
What is the maximum service temperature of 302HQ CW 1/2H?
302HQ CW 1/2H is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 302HQ CW 1/2H?
Yes — 302HQ CW 1/2H is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A493 — Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging — ASTM International (2023)
- ASTM A276 / A493 chemistry for UNS S30430 (XM-7) — ASTM International (2023)
- SAE J405 — Chemical Compositions of SAE Wrought Stainless Steels — SAE International (2013)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Cold-heading quality stainless wire grade 302HQ / S30430 data sheet — stainless wire producers (e.g. Sandvik / Suzuki Garphyttan class data) (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.