Steel TRIP Steel TRIP780
Grade
Most widely used TRIP class: crash-energy absorbing B-pillar and rail parts requiring both 780 MPa and >20 % elongation.
Values for the TRIP780 condition
Other TRIP Steel tempers and conditions
TRIP Steel is listed in 6 conditions; see the grade overview at TRIP Steel.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
590 MPa class (CR340Y590T-TR) | Lowest-strength TRIP class: choose when very deep draws or stretch flanging dominate and 590 MPa is enough. | 400 | 630 | 30 | 190 HB | 7.9 % IACS |
690 MPa class (HCT690T / CR400Y690T-TR) | Balanced class for seat structures and reinforcements needing high elongation with ~700 MPa strength. | 450 | 730 | 28 | 19 HRC | 7.7 % IACS |
Hot rolled | Pick for chassis, control arms and wheel parts in 2–6 mm gauge where cold-rolled thickness limits are exceeded; slightly coarser structure, lower elongation. | 460 | 750 | 24 | 20 HRC | 7.8 % IACS |
CRDefault Cold rolled | Standard stocked condition: cold rolled annealed TRIP sheet without metallic coating, for painted/e-coated interior structure and for lab or prototype forming trials. | 490 | 820 | 25 | 24 HRC | 7.5 % IACS |
TRIP780This page 780 MPa class (HCT780T / CR450Y780T-TR) | Most widely used TRIP class: crash-energy absorbing B-pillar and rail parts requiring both 780 MPa and >20 % elongation. | 490 | 820 | 25 | 24 HRC | 7.5 % IACS |
980 MPa class (CR700Y980T-TR) | Highest TRIP strength class for anti-intrusion members; expect reduced elongation, higher springback and tighter spot-welding limits. | 640 | 1,020 | 17 | 31 HRC | 7.2 % IACS |
What is TRIP Steel TRIP780?
TRIP Steel TRIP780 is TRIP Steel in the TRIP780 grade — most widely used TRIP class: crash-energy absorbing B-pillar and rail parts requiring both 780 MPa and >20 % elongation. TRIP Steel TRIP780 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 61% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi). TRIP Steel TRIP780 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F). CR is the default condition FabDigit quotes; TRIP780 is available on request or by drawing note.
Advantages
- Forms and bends easily — 72/100, better than 88% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Difficult to machine — 32/100, worse than 87% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades
TRIP Steel TRIP780 properties
Typical room-temperature values for TRIP Steel TRIP780; 23 are specific to this condition. Other listed values are TRIP Steel reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
TRIP Steel TRIP780 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical14
TRIP Steel TRIP780 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 61% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
TRIP Steel TRIP780 is rated for continuous service to 200°C (392 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
TRIP Steel TRIP780 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of TRIP Steel TRIP780 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
TRIP Steel TRIP780's machinability is poor (32/100, worse than 87% of steel grades); weldability good (60/100); formability very good (72/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with TRIP Steel TRIP780
Is TRIP Steel easy to machine?
Rarely machined; if drilling/trimming is needed use rigid setups, carbide or coated carbide, low speed and high feed — the retained austenite transforms and work-hardens the cut surface, and laser or waterjet trimming is usually preferred.
Can TRIP Steel be welded?
Resistance spot welding is standard but needs higher electrode force, pulsed or stepped current and possible post-pulse tempering; high Si/Al and C give hard, notch-sensitive nuggets, and laser or MAG welds show HAZ softening plus loss of TRIP effect.
Can TRIP Steel be formed, bent or molded?
Cold stamp with high-n TRIP behaviour: good stretch and deep draw, but plan for high forming loads, strong springback compensation, generous die radii and hole-expansion/delayed-cracking checks on sheared edges.
What surface finishes work on TRIP Steel?
Supply zinc-coated (GI/GA/EG) or phosphate + e-coat; bare TRIP rusts quickly, and paint-bake cycles (~170 °C/20 min) give a useful bake-hardening yield increase rather than harm.
TRIP Steel 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 |
|---|---|---|
| Cstabilizes retained austenite | 0.12 – 0.25 | 0.2 |
| Sisuppresses carbide precipitation during bainitic hold; complicates galvanizing | 0.5 – 2.2 | 1.5 |
| Mnhardenability and austenite stabilization | 1.2 – 2.5 | 1.8 |
| Alpartial Si substitute in galvanizable TRIP grades | 0.02 – 2 | 0.05 |
| PEN 10338 limit; sometimes used as carbide suppressor | ≤ 0.12 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Nbmicroalloy grain refiner (optional) | ≤ 0.09 | 0.03 |
| Tioptional | ≤ 0.12 | 0.02 |
| Voptional | ≤ 0.2 | — |
| Cr+Mooptional, retards pearlite | ≤ 0.5 | 0.1 |
| Fe | balance | — |
TRIP Steel TRIP780 — frequently asked
What is TRIP Steel TRIP780 used for?
TRIP Steel TRIP780 is typically used for B-pillar reinforcements, crash structures and front rails, bumper beams, cross members, seat frames and rocker and floor reinforcements. In short: crash-grade TRIP sheet.
What is the yield strength of TRIP Steel TRIP780?
TRIP Steel TRIP780 has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 61% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is TRIP Steel TRIP780 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 87% of steel grades). Rarely machined; if drilling/trimming is needed use rigid setups, carbide or coated carbide, low speed and high feed — the retained austenite transforms and work-hardens the cut surface, and laser or waterjet trimming is usually preferred.
Can TRIP Steel TRIP780 be welded?
Yes — weldability is rated good (60/100). Resistance spot welding is standard but needs higher electrode force, pulsed or stepped current and possible post-pulse tempering; high Si/Al and C give hard, notch-sensitive nuggets, and laser or MAG welds show HAZ softening plus loss of TRIP effect.
What surface finishes work on TRIP Steel TRIP780?
Supply zinc-coated (GI/GA/EG) or phosphate + e-coat; bare TRIP rusts quickly, and paint-bake cycles (~170 °C/20 min) give a useful bake-hardening yield increase rather than harm.
Can TRIP Steel TRIP780 be formed, bent or molded?
Cold stamp with high-n TRIP behaviour: good stretch and deep draw, but plan for high forming loads, strong springback compensation, generous die radii and hole-expansion/delayed-cracking checks on sheared edges.
What is the maximum service temperature of TRIP Steel TRIP780?
TRIP Steel TRIP780 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 TRIP Steel-CR and TRIP Steel TRIP980?
CR is the default condition — standard stocked condition: cold rolled annealed TRIP sheet without metallic coating, for painted/e-coated interior structure and for lab or prototype forming trials. TRIP980: highest TRIP strength class for anti-intrusion members; expect reduced elongation, higher springback and tighter spot-welding limits. Yield strength is 490 MPa in CR versus 640 MPa in TRIP980.
Can FabDigit make parts in TRIP Steel TRIP780?
Yes — TRIP Steel TRIP780 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
- EN 10338 — Hot rolled and cold rolled uncoated products of multiphase steels for cold forming — CEN (2015)
- VDA 239-100 — Sheet steel for cold forming (CR450Y780T-TR etc.) — VDA (2016)
- 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)
- TRIP 690 / TRIP 780 cold rolled steel datasheets — ArcelorMittal / thyssenkrupp Steel (2023)
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.