Steel 34ХН1МА (34ХН1М)

Designation

Name The value
Designation GOST Cyrillic 34ХН1МА
Designation GOST Latin 34XH1MA
Transliteration 34HN1MA
By chemical elements 34CrН1Mo
Name The value
Designation GOST Cyrillic 34ХН1М
Designation GOST Latin 34XH1M
Transliteration 34HN1M
By chemical elements 34CrН1Mo

Description

34ХН1МА steel is used: for the manufacture of forgings of various parts of General engineering; of forgings of shafts of compressors and gas turbines; shafts, rotors, workpieces disks of steam turbines with operating temperatures up to +350 °C, the shaft-gears, couplings, gear wheels and other critical heavily loaded parts operating at temperatures up to +500 °C; billet shafts and solid-forged rotors of stationary and transport steam turbines.

Note

High alloy steel high quality.

Standards

Name Code Standards
Processing of metals by pressure. Forgings В03 TU 108-1028-81, TU 108-1029-81, TU НЗЛ 342-89, TU 0306.018-80, TU 108.11.917-87
Blanks. Of the workpiece. Slabs В31 TU НЗЛ 341-93

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo
TU 108-1029-81 0.3-0.4 ≤0.022 ≤0.025 0.5-0.8 1.3-1.7 ≤0.37 1.3-1.7 Rest ≤0.25 0.2-0.3
TU НЗЛ 342-89 0.3-0.4 ≤0.025 ≤0.025 0.5-0.8 1.3-1.7 0.17-0.37 1.3-1.7 Rest ≤0.3 0.2-0.3
Fe is the basis.
On 108.11.917-87 and TU NZL 342-89 the chemical composition is given for steel grade 34HN1MA.
According to TU 108-1028-81 and TU 108-1029-81 the chemical composition is given for steel grade 34ХН1МА. In the workpieces, deviations in the content of the elements indicated in the table are allowed: carbon ± 0.010%, silicon + 0.030%.
In the manufacture of blanks with discs with hub heights from 450 to 650 mm, the content of phosphorus and sulfur in steel should not be more than 0.018% of each; for metal VDP and ELP, the deviation of manganese content +0.10% / - 0.15% is allowed. In the ESR steel, the sulfur content should not be more than 0.015%. When casting steel without evacuation, for the manufacture of disc blanks with a hub height of more than 300 mm, hydrogen content in the metal must be determined. The results of determination of the hydrogen content are not acceptance-delivery and, at the request of the consumer, are to be entered in the procurement certificate.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Forged billet shafts of compressors and gas turbines, heat-treated in the delivery condition on the other NZL 342-89 (longitudinal samples, in the column of the delivery condition specified strength)
≤550 490-687 ≥638 ≥15 ≥35 ≥490
≤450 590-765 ≥705 ≥15 ≥35 ≥490
≤300 687-883 ≥803 ≥14 ≥35 ≥490
≤300 736-931 ≥852 ≥13 ≥35 ≥490
Billet shafts and rotors of steam turbines on the other 108-1029-81 (in the delivery condition specified strength and direction and place the cuttings sample)
- 638-834 ≥804 ≥14 ≥40 ≥590
- 638-834 ≥765 ≥11 ≥32 ≥440
Forged blanks of disks of steam turbines on the other 108-1028-81 (in the delivery condition specified strength; in cross-section, if regulated, see the recommended height of the hub)
- 490-687 ≥657 ≥15 ≥40 ≥490
≤300 589-785 ≥765 ≥14 ≥40 ≥490
≤250 664-833 ≥815 ≥12 ≥40 ≥490

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness

Technological properties

Name The value
Weldability Difficult weldability.
Склонность к отпускной хрупкости Malosolone.
Flock-sensitive sensitivity Sensitive.