Steel QP1180
QP1180 is the higher-strength third-generation quenching-and-partitioning sheet steel, using retained austenite in a martensitic matrix to give a better strength–ductility balance than conventional DP or CP grades at the same strength level.
Reference datasheet — QP1180 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CR condition
QP1180 tempers and conditions
QP1180 is supplied in 2 conditions, soft to hard. CR is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CRDefault Cold rolled | Default uncoated cold-rolled Q&P coil/blank for interior structural parts that are e-coated after assembly. | 920 | 1,240 | 15 | 39 HRC | — |
Formed + paint baked | Represents the in-service part condition: bake hardening plus prestrain raises yield strength and slightly reduces remaining ductility. | 1,010 | 1,290 | 11 | 40 HRC | 3.8 % IACS |
Supply forms, finishes and certifications
Ways QP1180 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EG | Electrogalvanized | Coating |
GA | Galvannealed | Coating |
GI | Hot-dip galvanized | Coating |
What is QP1180?
QP1180 is the higher-strength third-generation quenching-and-partitioning sheet steel, using retained austenite in a martensitic matrix to give a better strength–ductility balance than conventional DP or CP grades at the same strength level. It provides 920 MPa yield, 1240 MPa tensile and 15 % elongation at about 39 HRC, and is available cold-rolled (CR), zinc-coated (GI, GA, EG) and pre-baked (PB). High carbon equivalent makes spot welds hard and notch-sensitive, and the grade has no inherent corrosion resistance, with service capped near 200 °C. Where higher ductility matters more than strength, step down to QP980. QP1180 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). QP1180 has a yield strength of 920 MPa (133 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 90% of steel grades. Elongation at break is 15% and the elastic modulus is 207 GPa (30 Msi).
What is QP1180 used for?
- B-pillar reinforcements
- sills
- crash-critical brackets
Advantages
- High strength — 920 MPa (133 ksi), better than 90% of steel grades
Limitations
- Difficult to machine — 22/100, worse than 95% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 86% of steel grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
QP1180 properties
Typical room-temperature values for QP1180-CR; bars are the position among steel grades.
Physical3
QP1180 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical13
QP1180 has a yield strength of 920 MPa (133 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 90% of steel grades. Elongation at break is 15% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
QP1180 is rated for continuous service to 200°C (392 °F). It conducts heat at 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
QP1180 conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of QP1180 takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
QP1180's machinability is poor (22/100, worse than 95% of steel grades); weldability good (60/100); formability fair (47/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. QP1180 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with QP1180
Is QP1180 easy to machine?
Avoid conventional machining of finished parts — use laser or fine blanking with hardened tool steel/carbide, generous clearance and 380 HV-rated punches to limit edge damage.
Can QP1180 be welded?
Resistance spot welding works with reduced current and long/pulsed schedules plus post-weld tempering pulse; high carbon equivalent gives hard, notch-sensitive nuggets, and Zn-coated sheet needs LME-mitigating electrode force and cooling.
Can QP1180 be formed, bent or molded?
Cold stamp with generous radii, high blank-holder force and springback compensation in die design; keep sheared edges smooth (laser or low-clearance trim) to avoid hole-expansion and delayed hydrogen cracking failures.
QP1180 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 |
|---|---|---|
| Ccarbon partitioned into retained austenite | 0.17 – 0.25 | 0.2 |
| Sisuppresses carbide formation during partitioning; may be partly replaced by Al | 1.2 – 1.8 | 1.5 |
| Mn | 1.8 – 2.6 | 2.2 |
| Aldeoxidation; higher Al in Si-lean galvanizing-friendly variants | 0.02 – 0.6 | 0.05 |
| Crhardenability, optional | ≤ 0.5 | 0.2 |
| Mooptional | ≤ 0.3 | 0.1 |
| Nbgrain refinement | ≤ 0.06 | 0.03 |
| Tioptional microalloy | ≤ 0.06 | 0.02 |
| Boptional | ≤ 0 | |
| Pimpurity limit | ≤ 0.02 | 0.01 |
| Simpurity limit | ≤ 0.01 | 0 |
| Nimpurity limit | ≤ 0.01 | 0 |
| Fe | balance |
What surface finishes work on QP1180?
Not anodizable — protect with hot-dip/electro zinc coating, zinc-phosphate pretreatment and cathodic e-coat; avoid acid pickling and high-temperature (>250 °C) coatings that temper the partitioned microstructure.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
How much does QP1180 cost?
QP1180 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
QP1180 — frequently asked
What is QP1180 used for?
QP1180 is typically used for B-pillar reinforcements, sills and crash-critical brackets. In short: formable 1200 MPa class; third-generation AHSS; better draws than DP1180.
What is the yield strength of QP1180?
QP1180 has a typical yield strength of 920 MPa (133 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 90% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is QP1180 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of steel grades). Avoid conventional machining of finished parts — use laser or fine blanking with hardened tool steel/carbide, generous clearance and 380 HV-rated punches to limit edge damage.
Can QP1180 be welded?
Yes — weldability is rated good (60/100). Resistance spot welding works with reduced current and long/pulsed schedules plus post-weld tempering pulse; high carbon equivalent gives hard, notch-sensitive nuggets, and Zn-coated sheet needs LME-mitigating electrode force and cooling.
What surface finishes work on QP1180?
Not anodizable — protect with hot-dip/electro zinc coating, zinc-phosphate pretreatment and cathodic e-coat; avoid acid pickling and high-temperature (>250 °C) coatings that temper the partitioned microstructure.
Can QP1180 be formed, bent or molded?
Cold stamp with generous radii, high blank-holder force and springback compensation in die design; keep sheared edges smooth (laser or low-clearance trim) to avoid hole-expansion and delayed hydrogen cracking failures.
What is the maximum service temperature of QP1180?
QP1180 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between QP1180-CR and QP1180-PB?
CR is the default condition — default uncoated cold-rolled Q&P coil/blank for interior structural parts that are e-coated after assembly. PB: represents the in-service part condition: bake hardening plus prestrain raises yield strength and slightly reduces remaining ductility. Yield strength is 920 MPa in CR versus 1,010 MPa in PB.
How much does QP1180 cost?
QP1180 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- Q&P steel product sheets (QP980 / QP1180) — Baosteel / Ansteel / Benxi Steel (2023)
- AHSS Application Guidelines V7 — 3rd Generation Steels (Q&P) — WorldAutoSteel (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Life-cycle inventory data for cold-rolled steel coil — worldsteel association (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.