HOT ROLLED SPRING STEEL

NORM: PN/EN 10132-4:2002U

APPLICATION:

Steel susceptible for the flat springs thick up to 6 mm, spring plates etc.

CHEMICAL COMPOSITION:

CMnSiPSCrNiMoVWTiCuInne
0,65-0,730,6-0,90,15- 0,35MAX 0,025MAX 0,025MAX 0,4MAX 0,4MAX 0,1-----

MECHANICAL PROPERTIES:

Mechanical steel properties after annealing or annealing and finished rolling for the product with thickness of 0.3 mm ≤ t < 3 mm
Property Symbol Unit After heat treatment
Ultimate tensile strength Rm MPa ≤ 510
Yield stress Re (Rp0.2) MPa ≥ 640
Elongation A % ≥ 16
Reduction of area Z %
Hardness HV HV ≤ 200
Mechanical steel properties after cold rolling for the products with thickness of 0.3 mm ≤ t < 3 mm
Property Symbol Unit Value
Ultimate tensile strength Rm MPa ≤ 1140
Hardness HV HV ≤ 315
Mechanical steel properties after toughening for the product with thickness of 0.3 mm ≤ t < 3 mm
Property Symbol Unit Value
Ultimate tensile strength Rm MPa 1200 – 1700
Hardness HV HV 370-580
Effect of the cross-section on steel mechanical properties after toughening
Thickness, mm 0.3 ≤ 0.5 0.5 ≤ 0.75 0.75 ≤ 1 1 ≤ 1.5 1.5 ≤ 2 2 ≤ 3
Hardness HV 485-535 465-515 455-505 445-495 425-475 415-465

Technological treatment processes:

Technological treatment processes Possible application Temperature, °C
Hot forming Forging
Rolling + (1180 – 850)
Treatment Heat treatment Quenching + 815-845/w,o
Tempering + (300 – 500)
Precipitation strengthening Supersaturation
Ageing
Annealing Normalising + (800 – 830)
Soft annealing + (650 – 690)
Thermochemical treatment Carburising
Other

INTERNATIONAL STEEL GRADES:

ISO EN Russia
~CS 65 ISO 4960: 1999 C67S EN 10132-4: 2000 ~ 68GA GOST 1071-81
US Japan China
~1070 ASTM A 689-97 ~S 70 C-CSP JIS G 4802 1999 ~65 GB 1222-84