Steel 34MnB5-A (Solution annealed)
Temper
EN 34MnB5
Pick for maximum cold formability or for machining of thick blanks before hardening.
Values for the A condition
Other 34MnB5 tempers and conditions
34MnB5 is listed in 7 conditions; see the grade overview at 34MnB5.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AThis page Solution annealed | Pick for maximum cold formability or for machining of thick blanks before hardening. | 340 | 560 | 22 | 165 HB | 8 % IACS |
CRDefault Cold rolled | Standard stocked condition: soft ferritic-pearlitic cold-rolled coil/blank for blanking and subsequent press hardening or Q&T. | 420 | 620 | 14 | 185 HB | — |
Hot rolled | Hot-rolled coil/plate for thicker press-hardened parts, wear plates and agricultural tool blanks before quenching. | 450 | 680 | 16 | 14 HRC | 8 % IACS |
Normalized | Uniform fine ferritic-pearlitic structure for moderate strength parts and as a pre-treatment before quench and temper. | 480 | 760 | 15 | 18 HRC | 8 % IACS |
Q&T 40-45 HRC | Higher tempering temperature for impact-loaded hardened components where 50+ HRC would be too brittle. | 1,150 | 1,350 | 11 | 42 HRC | — |
Pre-hardened | The end-use condition for hot-stamped structural/wear parts where ~2000 MPa strength and high hardness are required. | 1,400 | 1,950 | 4.5 | 53 HRC | — |
Q&T 48-52 HRC | Choose when hardened parts (plough shares, cutting edges, wear plates) need some toughness traded against peak hardness. | 1,400 | 1,650 | 8 | 50 HRC | — |
What is 34MnB5-A?
34MnB5-A is 34MnB5 in the A temper — pick for maximum cold formability or for machining of thick blanks before hardening. 34MnB5-A has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi). 34MnB5-A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). CR is the default condition FabDigit quotes; A is available on request or by drawing note.
Advantages
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
34MnB5-A properties
Typical room-temperature values for 34MnB5-A; 22 are specific to this condition. Other listed values are 34MnB5 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
34MnB5-A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
34MnB5-A has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
34MnB5-A is rated for continuous service to 400°C (752 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
34MnB5-A conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 34MnB5-A takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
34MnB5-A's machinability is good (60/100, better than 83% of steel grades); weldability good (60/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 34MnB5-A
Is 34MnB5 easy to machine?
Machine and drill in the soft as-delivered or annealed state; after press hardening (50+ HRC) use carbide/CBN, grinding or laser cutting only.
Can 34MnB5 be welded?
Weldable by RSW/laser in the soft state; boron raises hardenability so use low hydrogen consumables, preheat ~150–250 °C on thick sections, and expect HAZ softening/brittleness on hardened parts.
Can 34MnB5 be formed, bent or molded?
Cold form or blank only in the as-delivered condition; final geometry is normally produced by direct hot stamping at 900–950 °C with in-die quenching (>30 °C/s) — hardened parts are essentially non-formable.
What surface finishes work on 34MnB5?
No anodizing; use Al-Si pre-coating for furnace protection, or shot blast plus zinc-phosphate/e-coat, zinc-flake or paint for corrosion protection.
34MnB5 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 |
|---|---|---|
| Chigh-carbon press-hardening variant | 0.3 – 0.37 | 0.34 |
| Si | 0.1 – 0.4 | 0.25 |
| Mn | 1 – 1.4 | 1.2 |
| P | ≤ 0.03 | |
| Smax (0.025 max on some hot-rolled deliveries) | ≤ 0.01 | |
| Cr | 0.1 – 0.35 | 0.2 |
| Altotal Al | 0.02 – 0.07 | 0.04 |
| Tities up N so B stays effective | 0.02 – 0.05 | 0.04 |
| Bhardenability booster | 0 – 0.01 | 0 |
| Fe | balance |
34MnB5-A — frequently asked
What is 34MnB5-A used for?
34MnB5-A is typically used for press-hardened B-pillar reinforcements, bumper beams, door impact beams, roof and rocker rails, floor and tunnel cross-members and high-strength fasteners. In short: boron-bearing CR steel.
What is the yield strength of 34MnB5-A?
34MnB5-A has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 34MnB5-A easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machine and drill in the soft as-delivered or annealed state; after press hardening (50+ HRC) use carbide/CBN, grinding or laser cutting only.
Can 34MnB5-A be welded?
Yes — weldability is rated good (60/100). Weldable by RSW/laser in the soft state; boron raises hardenability so use low hydrogen consumables, preheat ~150–250 °C on thick sections, and expect HAZ softening/brittleness on hardened parts.
What surface finishes work on 34MnB5-A?
No anodizing; use Al-Si pre-coating for furnace protection, or shot blast plus zinc-phosphate/e-coat, zinc-flake or paint for corrosion protection.
Can 34MnB5-A be formed, bent or molded?
Cold form or blank only in the as-delivered condition; final geometry is normally produced by direct hot stamping at 900–950 °C with in-die quenching (>30 °C/s) — hardened parts are essentially non-formable.
What is the maximum service temperature of 34MnB5-A?
34MnB5-A is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 34MnB5-CR and 34MnB5-PH?
CR is the default condition — standard stocked condition: soft ferritic-pearlitic cold-rolled coil/blank for blanking and subsequent press hardening or Q&T. PH: the end-use condition for hot-stamped structural/wear parts where ~2000 MPa strength and high hardness are required. Yield strength is 420 MPa in CR versus 1,400 MPa in PH.
Can FabDigit make parts in 34MnB5-A?
Yes — 34MnB5-A 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 10083-3 Steels for quenching and tempering — alloy steels (boron grades) — CEN (2006)
- EN 10346 Continuously hot-dip / Al-Si coated flat steel products — CEN (2015)
- Press-hardening (hot-stamping) steel grades 22MnB5 / 30MnB5 / 34MnB5 data — ArcelorMittal / SSAB / voestalpine (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating — ASM International (1991)
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.