Steel SPFH980 HR-BLK
Finish state
HR-BLK = as-hot-rolled, black (mill scale) coil
Cheapest supply form for parts that are shot-blasted or machined after forming; scale must be removed before welding/painting.
Values for the HR-BLK condition
Other SPFH980 tempers and conditions
SPFH980 is listed in 4 conditions; see the grade overview at SPFH980.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CR | Use for thin (0.6–2.3 mm) body/structural panels where surface quality and higher uniform elongation are needed. | 630 | 1,020 | 13 | 30 HRC | 8.5 % IACS |
HR-PODefault Hot rolled, pickled and oiled | Standard supply condition for chassis stampings: clean scale-free surface ready for forming, welding and e-coat. | 700 | 1,030 | 12 | 31 HRC | 8.5 % IACS |
HR-BLKThis page As-hot-rolled, black (mill scale) coil | Cheapest supply form for parts that are shot-blasted or machined after forming; scale must be removed before welding/painting. | 700 | 1,030 | 11 | 31 HRC | 8.5 % IACS |
hot rolled complex-phase / high hole-expansion 980 (FB-type) | Pick when stretch-flanging, hole expansion (λ ≥ 50 %) and edge-crack resistance matter more than total elongation — wheel discs, arms. | 850 | 1,010 | 10 | 32 HRC | 8.5 % IACS |
What is SPFH980 HR-BLK?
SPFH980 HR-BLK is SPFH980 supplied in the HR-BLK condition — cheapest supply form for parts that are shot-blasted or machined after forming; scale must be removed before welding/painting. SPFH980 HR-BLK has a yield strength of 700 MPa (102 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of steel grades. Elongation at break is 11% and the elastic modulus is 207 GPa (30 Msi). SPFH980 HR-BLK has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F). HR-PO is the default condition FabDigit quotes; HR-BLK is available on request or by drawing note.
Advantages
- High strength — 700 MPa (102 ksi), better than 81% of steel grades
Limitations
- Difficult to machine — 26/100, worse than 92% of steel grades
- Limited ductility — 11%, worse than 89% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
SPFH980 HR-BLK properties
Typical room-temperature values for SPFH980 HR-BLK; 22 are specific to this condition. Other listed values are SPFH980 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
SPFH980 HR-BLK has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F).
Mechanical16
SPFH980 HR-BLK has a yield strength of 700 MPa (102 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of steel grades. Elongation at break is 11% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
SPFH980 HR-BLK is rated for continuous service to 250°C (482 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
SPFH980 HR-BLK conducts electricity at 8.5 % IACS, better than 63% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of SPFH980 HR-BLK takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
SPFH980 HR-BLK's machinability is poor (26/100, worse than 92% of steel grades); weldability fair (50/100); formability poor (27/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SPFH980 HR-BLK
Is SPFH980 easy to machine?
Rarely machined; if drilling/trimming is needed use rigid setups, coated carbide, low speed–high feed, and expect fast tool wear at ~310 HV — laser or fine-blanking is preferred.
Can SPFH980 be welded?
Resistance spot welding is standard but needs reduced current/longer hold or pulsed schedules to limit HAZ softening and interfacial fracture; zinc-coated variants are LME-sensitive; laser and MAG welding lower strength in the HAZ, so avoid placing welds in peak-stress zones.
Can SPFH980 be formed, bent or molded?
Cold form with high-tonnage presses, generous die radii (≥4–6 t), high blank-holder force and springback compensation in the die face; edge condition governs stretch-flange cracking, so use sharp, well-maintained trim tools or laser-cut-then-mill edges.
What surface finishes work on SPFH980?
Not anodizable; protect with zinc coating (GI/GA/EG), zinc-phosphate + cathodic e-coat, or organic coating. Avoid strong acid pickling and acid electroplating after forming to prevent hydrogen-induced delayed cracking.
SPFH980 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 |
|---|---|---|
| CDP/CP hot-rolled 980 range | 0.07 – 0.16 | 0.12 |
| Si | 0.05 – 0.8 | 0.35 |
| Mn | 1.4 – 2.4 | 1.9 |
| P | ≤ 0.02 | 0.01 |
| Smax; low S for hole expansion | ≤ 0.01 | 0 |
| Alsol. Al | 0.02 – 0.07 | 0.04 |
| Crhardenability | ≤ 0.8 | 0.3 |
| Mohardenability | ≤ 0.4 | 0.15 |
| Nbgrain refinement | ≤ 0.06 | 0.03 |
| Tiprecipitation / N fixation | ≤ 0.12 | 0.04 |
| Boptional | ≤ 0.01 | 0 |
| N | ≤ 0.01 | 0 |
| Fe | balance | — |
SPFH980 HR-BLK — frequently asked
What is SPFH980 HR-BLK used for?
SPFH980 HR-BLK is typically used for structural rails, heavy chassis brackets and wheel rims. In short: hot-rolled 1030 MPa class; chassis-grade DP980 equivalent; strength over formability.
What is the yield strength of SPFH980 HR-BLK?
SPFH980 HR-BLK has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is SPFH980 HR-BLK easy to machine?
Not especially — machinability is rated poor (26/100, worse than 92% of steel grades). Rarely machined; if drilling/trimming is needed use rigid setups, coated carbide, low speed–high feed, and expect fast tool wear at ~310 HV — laser or fine-blanking is preferred.
Can SPFH980 HR-BLK be welded?
With care — weldability is rated fair (50/100). Resistance spot welding is standard but needs reduced current/longer hold or pulsed schedules to limit HAZ softening and interfacial fracture; zinc-coated variants are LME-sensitive; laser and MAG welding lower strength in the HAZ, so avoid placing welds in peak-stress zones.
What surface finishes work on SPFH980 HR-BLK?
Not anodizable; protect with zinc coating (GI/GA/EG), zinc-phosphate + cathodic e-coat, or organic coating. Avoid strong acid pickling and acid electroplating after forming to prevent hydrogen-induced delayed cracking.
Can SPFH980 HR-BLK be formed, bent or molded?
Cold form with high-tonnage presses, generous die radii (≥4–6 t), high blank-holder force and springback compensation in the die face; edge condition governs stretch-flange cracking, so use sharp, well-maintained trim tools or laser-cut-then-mill edges.
What is the maximum service temperature of SPFH980 HR-BLK?
SPFH980 HR-BLK is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between SPFH980 HR-PO and SPFH980 HR-BLK?
HR-PO is the default condition — standard supply condition for chassis stampings: clean scale-free surface ready for forming, welding and e-coat. HR-BLK: cheapest supply form for parts that are shot-blasted or machined after forming; scale must be removed before welding/painting. Yield strength is 700 MPa in HR-PO versus 700 MPa in HR-BLK.
Sources
- JIS G 3134 — Hot-rolled high strength steel plate and strip for automobile structural uses — JSA (2018)
- Advanced High-Strength Steels Application Guidelines V7 — WorldAutoSteel (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Hot-rolled high-tensile steel sheet for automotive (980 MPa class) product data — Nippon Steel / JFE Steel (2022)
- AWS D8.1M — Specification for Automotive Weld Quality, Resistance Spot Welding of Steel — AWS (2013)
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.