Steel H08A CD-Cu
Finish state
CD-Cu = cold drawn, copper-coated welding wire
Pick the copper-coated cold-drawn wire as the standard finished delivery form; the coating improves contact-tip conduction and rust protection for use with HJ431/SJ101 flux.
Values for the CD-Cu condition
Other H08A tempers and conditions
H08A is listed in 4 conditions; see the grade overview at H08A.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
soft annealed (in-process, for heavy drawing) | Use the soft annealed in-process condition between cold-drawing passes to restore ductility to 38 % elongation so the rod can be drawn down to fine welding-wire gauges. | 210 | 370 | 38 | 105 HB | 11 % IACS |
As-welded deposit | Use the as-welded submerged-arc deposit properties, obtained with HJ431 or SJ101 flux, for joint design; actual values shift with flux grade and dilution ratio. | 360 | 480 | 28 | 145 HB | 10 % IACS |
Cold drawn | Choose cold-drawn bright wire in Φ1.6–5.0 mm for stainless or copper-lined feed systems and short-term use; drawing lifts tensile to 620 MPa but cuts elongation to 10 %. | 500 | 620 | 10 | 12 HRC | 11 % IACS |
CD-CuThis page Cold drawn, copper-coated welding wire | Pick the copper-coated cold-drawn wire as the standard finished delivery form; the coating improves contact-tip conduction and rust protection for use with HJ431/SJ101 flux. | 520 | 640 | 9 | 13 HRC | 10.5 % IACS |
What is H08A CD-Cu?
H08A CD-Cu is H08A supplied in the CD-Cu condition — pick the copper-coated cold-drawn wire as the standard finished delivery form; the coating improves contact-tip conduction and rust protection for use with HJ431/SJ101 flux. H08A CD-Cu has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 67% of steel grades. Elongation at break is 9% and the elastic modulus is 205 GPa (29.7 Msi). H08A CD-Cu has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Advantages
- Readily welded — 96/100, better than 100% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
- Limited ductility — 9%, worse than 93% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
H08A CD-Cu properties
Typical room-temperature values for H08A CD-Cu; 23 are specific to this condition. Other listed values are H08A reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
H08A CD-Cu has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical13
H08A CD-Cu has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 67% of steel grades. Elongation at break is 9% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
H08A CD-Cu is rated for continuous service to 300°C (572 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
H08A CD-Cu conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of H08A CD-Cu takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
H08A CD-Cu's machinability is good (62/100, better than 89% of steel grades); weldability excellent (96/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with H08A CD-Cu
Is H08A easy to machine?
Very soft, low-carbon and low-sulphur, so it smears and raises burrs and tends to build up on the tool; use sharp, high positive rake tooling at high cutting speed. It is not intended as a machining steel.
Can H08A be welded?
This grade is the filler itself: pair with HJ431 or SJ101 flux for submerged-arc welding, or with the matching flux for CO₂ welding. The low carbon, sulphur and phosphorus give weld metal good hot-cracking resistance, and no preheat is needed on thin sections.
Can H08A be formed, bent or molded?
After pickling and coating, the rod is cold drawn continuously through multiple passes to φ0.8–5.0 mm. Work hardening is pronounced, so intermediate annealing is required for heavy reductions.
What surface finishes work on H08A?
Normally electroplated or electroless copper coated (0.2–0.4 µm class) to prevent rust and improve current transfer; phosphate plus soap coating is used as a drawing lubricant carrier.
H08A 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 |
|---|---|---|
| CGB/T 14957 H08A | ≤ 0.1 | 0.08 |
| Mn | 0.3 – 0.55 | 0.45 |
| Sinot Si-deoxidized; Si transferred from the flux | ≤ 0.03 | 0.02 |
| SClass A high-grade quality: tighter sulfur limit | ≤ 0.03 | 0.02 |
| P | ≤ 0.03 | 0.02 |
| Crresidual element | ≤ 0.2 | 0.05 |
| Niresidual element | ≤ 0.3 | 0.05 |
| Cuno copper coating | ≤ 0.2 | 0.08 |
| Fe | balance | — |
H08A CD-Cu — frequently asked
What is H08A CD-Cu used for?
H08A CD-Cu is typically used for submerged arc welding, base wire for coated electrodes and general steel welding wire production. In short: standard SAW base wire; low sulphur and phosphorus; excellent cold-drawing behaviour.
What is the yield strength of H08A CD-Cu?
H08A CD-Cu has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 67% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is H08A CD-Cu easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Very soft, low-carbon and low-sulphur, so it smears and raises burrs and tends to build up on the tool; use sharp, high positive rake tooling at high cutting speed. It is not intended as a machining steel.
Can H08A CD-Cu be welded?
Yes — weldability is rated excellent (96/100). This grade is the filler itself: pair with HJ431 or SJ101 flux for submerged-arc welding, or with the matching flux for CO₂ welding. The low carbon, sulphur and phosphorus give weld metal good hot-cracking resistance, and no preheat is needed on thin sections.
What surface finishes work on H08A CD-Cu?
Normally electroplated or electroless copper coated (0.2–0.4 µm class) to prevent rust and improve current transfer; phosphate plus soap coating is used as a drawing lubricant carrier.
Can H08A CD-Cu be formed, bent or molded?
After pickling and coating, the rod is cold drawn continuously through multiple passes to φ0.8–5.0 mm. Work hardening is pronounced, so intermediate annealing is required for heavy reductions.
What is the maximum service temperature of H08A CD-Cu?
H08A CD-Cu 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.
Sources
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels — ASM International (1990)
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.