24 July 2021 Gear Steel Bar
34CrNiMo6 Gear Steel Bar
34CrNiMo6(AISI 4340 / DIN 1.6582 / EN 24) Steel is a nickel chromium molybdenum alloy steel that widely used in Oil & Gas industry. It is a quality high tensile alloy steel. 34CrNiMo6 steel offers toughness and high strength in the heat treated condition. 34CrNiMo6 is usually supplied under quenched and tempered condition at the hardness of 24 – 29HRc.
34CrNiMo6 is a quenching and tempering steel with high strength, high toughness and good hardenability. Used for large axles, machine components, tools and high strength fasteners.
The steel can be induction hardened and it is weldable under certain conditions. Through hardenability to appr. 100 mm diameter bar with oil quenching.
356D - Standard steel variant
356Q - IQ (isotropic quality) variant.
6499 - low sulphur variant of 34CrNiMo6 Suitable for fasteners according to ISO 989 Grade 10.9 up to 90 mm bar diameter
6498 - A variant of the old swedish standard SS 2541
6502 - M-steel variant of 34CrNiMo6
SB9205 - A variant of 34CrNiMo6
Chemical Composition:
C | Si | Mn | Cr | Mo | Ni | other |
0,34 | 0,25 | 0,50 | 1,50 | 0,25 | 1,55 | (Pb) |
Mechanical Properties:
Diameter d [mm] | < 16 | >16 – 40 | >40 – 100 | >100 – 160 | >160 – 250 |
Thickness t [mm] | < 8 | 8<t<20 | 20<t<60 | 60<t<100 | 100<t<160 |
0,2% proof stress Rp0,2 [N/mm²] | min. 1000 | min. 900 | min. 800 | min. 700 | min. 600 |
Tensile strength Rm [N/mm²] | 1200 - 1400 | 1100 - 1300 | 1000 - 1200 | 900 - 1100 | 800 - 950 |
Fracture elongation A5 [%] | min. 9 | min. 10 | min. 11 | min. 12 | min. 13 |
Reduction of area Z [%] | min. 40 | min. 45 | min. 50 | min. 55 | min. 55 |
Notch impact energy ISO-V [J] | min. 35 | min. 45 | min. 45 | min. 45 | min. 45 |
Application:
Heat treatable steel for high strained automotive and motor construc-
tion components with a typical tensile strength range of 1000 - 1300 N/mm².
Hot forming and heat treatment:
Forging or hot rolling: 1100 - 850°C
Normalising: 850 - 880°C/air
Soft annealing: 650 - 680°C/furnace
Hardening: 830 - 860°C/oil
Tempering: 540 - 660°C/air
Equivalent Grades:
AISI/ASTM: 4340,
BS: 817M40 / EN24,
JIS: SCM447,
DIN: 1.6582,