Steel 835M30-V
Hardness band
BS 835M30
V = hardened and tempered, 1000–1150 MPa
Common general-engineering H&T level for large-section shafts and couplings.
Values for the V condition
Other 835M30 tempers and conditions
835M30 is listed in 7 conditions; see the grade overview at 835M30.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed / softened (as-supplied for machining) | Choose for rough machining or forming before hardening; note the 4% Ni analysis stays relatively hard even after full annealing. | 560 | 800 | 18 | 22 HRC | — |
Hardened and tempered, 850–1000 MPa | Lowest H&T strength level; pick when maximum toughness and easiest machining/welding are wanted from this grade. | 730 | 920 | 16 | 27 HRC | — |
VThis page Hardened and tempered, 1000–1150 MPa | Common general-engineering H&T level for large-section shafts and couplings. | 890 | 1,075 | 14 | 33 HRC | — |
WDefault Solution heat treated (unstable) | Most widely stocked condition: good balance of ~1150 MPa strength, high toughness and full through-hardening in large sections. | 940 | 1,150 | 14 | 36 HRC | — |
Hardened and tempered, 1150–1300 MPa | Higher-strength aircraft/motorsport level where fatigue capacity matters more than machining ease. | 1,050 | 1,230 | 12 | 39 HRC | — |
Hardened and tempered, 1230–1380 MPa | High-strength landing-gear / torsion-shaft level; grinding usually replaces heavy turning. | 1,130 | 1,300 | 12 | 42 HRC | — |
Hardened and tempered, 1550 MPa minimum | Maximum strength condition for highly stressed aircraft parts; low tempering temperature means reduced toughness and high hydrogen-embrittlement sensitivity. | 1,400 | 1,620 | 9 | 49 HRC | — |
What is 835M30-V?
835M30-V is 835M30 heat treated to V — common general-engineering H&T level for large-section shafts and couplings. 835M30-V has a yield strength of 890 MPa (129 ksi) and a tensile strength of 1,075 MPa (156 ksi) — stronger than 90% of steel grades. Elongation at break is 14% and the elastic modulus is 205 GPa (29.7 Msi). 835M30-V has a density of 7.84 g/cm³ (0.283 lb/in³), lighter than 78% of steel grades. It melts at 1,420°C (2,588 °F). W is the default condition FabDigit quotes; V is available on request or by drawing note.
Advantages
- High strength — 890 MPa (129 ksi), better than 90% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- High embodied carbon — 2.9 kg CO₂/kg, worse than 91% of steel grades
- Difficult to machine — 34/100, worse than 86% of steel grades
- Low electrical conductivity — 5.5 % IACS, worse than 81% of steel grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
835M30-V properties
Typical room-temperature values for 835M30-V; 10 are specific to this condition. Other listed values are 835M30 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
835M30-V has a density of 7.84 g/cm³ (0.283 lb/in³), lighter than 78% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
835M30-V has a yield strength of 890 MPa (129 ksi) and a tensile strength of 1,075 MPa (156 ksi) — stronger than 90% of steel grades. Elongation at break is 14% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
835M30-V is rated for continuous service to 400°C (752 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
835M30-V conducts electricity at 5.5 % IACS, worse than 81% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of 835M30-V takes about 36 MJ of energy and emits 2.9 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 30%.
Manufacturability8
835M30-V's machinability is poor (34/100, worse than 86% of steel grades); weldability fair (40/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 835M30-V
Is 835M30 easy to machine?
Machine in the annealed or ≤340 HB H&T condition with rigid setups, sharp carbide and generous coolant; above 400 HB switch to grinding or ceramic/CBN tooling, and allow for the grade's air-hardening tendency in heat-affected surfaces.
Can 835M30 be welded?
Weldable by TIG/MIG/SMAW with low-hydrogen consumables, 150–250 °C preheat maintained through welding and immediate stress relief/temper below the last tempering temperature; re-heat-treat critical joints made in the Y/Z conditions.
Can 835M30 be formed, bent or molded?
Hot forge 1150–850 °C then slow cool or anneal; cold forming is impractical at H&T strengths, so bends and upsets must be done before hardening.
What surface finishes work on 835M30?
Not corrosion resistant — protect with Cd, Zn-Ni or IVD aluminium plating, phosphate or primer/paint; bake at ~190 °C for 8–23 h after electroplating parts above ~1000 MPa to avoid hydrogen embrittlement.
835M30 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 |
|---|---|---|
| C | 0.27 – 0.33 | 0.3 |
| Si | 0.1 – 0.35 | 0.25 |
| Mn | 0.45 – 0.7 | 0.55 |
| Nigives the very high hardenability | 3.9 – 4.3 | 4.1 |
| Cr | 1.1 – 1.4 | 1.25 |
| Mosuppresses temper embrittlement | 0.2 – 0.35 | 0.28 |
| Pmax; aerospace melts typically ≤0.015 | ≤ 0.04 | — |
| Smax; aerospace melts typically ≤0.015 | ≤ 0.04 | — |
| Fe | balance | — |
835M30-V — frequently asked
What is 835M30-V used for?
835M30-V is typically used for aircraft landing gear, structural fittings and high-strength bolts. In short: weldable high-strength aircraft steel; 1150 MPa in default condition; air-hardening, low machinability.
What is the yield strength of 835M30-V?
835M30-V has a typical yield strength of 890 MPa (129 ksi) and a tensile strength of 1,075 MPa (156 ksi) — stronger than 90% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 835M30-V easy to machine?
Not especially — machinability is rated poor (34/100, worse than 86% of steel grades). Machine in the annealed or ≤340 HB H&T condition with rigid setups, sharp carbide and generous coolant; above 400 HB switch to grinding or ceramic/CBN tooling, and allow for the grade's air-hardening tendency in heat-affected surfaces.
Can 835M30-V be welded?
With care — weldability is rated fair (40/100). Weldable by TIG/MIG/SMAW with low-hydrogen consumables, 150–250 °C preheat maintained through welding and immediate stress relief/temper below the last tempering temperature; re-heat-treat critical joints made in the Y/Z conditions.
What surface finishes work on 835M30-V?
Not corrosion resistant — protect with Cd, Zn-Ni or IVD aluminium plating, phosphate or primer/paint; bake at ~190 °C for 8–23 h after electroplating parts above ~1000 MPa to avoid hydrogen embrittlement.
Can 835M30-V be formed, bent or molded?
Hot forge 1150–850 °C then slow cool or anneal; cold forming is impractical at H&T strengths, so bends and upsets must be done before hardening.
What is the maximum service temperature of 835M30-V?
835M30-V 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 835M30-W and 835M30-Z?
W is the default condition — most widely stocked condition: good balance of ~1150 MPa strength, high toughness and full through-hardening in large sections. Z: maximum strength condition for highly stressed aircraft parts; low tempering temperature means reduced toughness and high hydrogen-embrittlement sensitivity. Yield strength is 940 MPa in W versus 1,400 MPa in Z.
Sources
- BS 970-1: Wrought steels for mechanical and allied engineering purposes (835M30 / En30B) — BSI (1991)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- MMPDS-17 (4330V / low-alloy high-strength steels) — Battelle/FAA (2022)
- En30B / 835M30 alloy steel bar datasheet — UK alloy steel stockist (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.