High-Performance S690G3QL Steel – Quenched & Tempered for Wear-Resistant Applications

S690G3QL is a fluid-tempered high strength weldable fine grained steel with a min. yield point of 690 N/mm². It is applicated for constructions whose behaviour predominantly depends on wear resistance of the material, e.g. wearing parts of mining and earth moving machines transport and crushing and grinding machines, scrap presses and other work machines. The usual thickness range amounts 3 to 150 mm. The lowest application temperature accounts for -50°C. The steel is processed by cold forming, at temperatures below the highest permissible stress relieving temperature of 530 to 580 °C. After hot forming at 700 to 1050 °C has to be coducted a retempering in order to achieve delivery condition qualities. The steel is combustible and electric arc cuttable subject to appropriate mode of operation. Flame cutting is affected by the surface condition. Preheating to 100 to 200 °C is advisable for workpiece temperatures below 5 °C and if the thermal cut edges should be cold formed on processing. Instructions: The steel is suitability tested for the construction of pressure vessels and pressure pipes according to the regulations valid in Germany (VdTÜV-material data sheet 257).

Properties

General

Property	Temperature	Value
Density	20.0 °C	7.84 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	210 GPa
Elongation	20.0 °C	14 %
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Steel
Tensile strength	20.0 °C	620 - 900 MPa
Yield strength	20.0 °C	620 - 690 MPa

Thermal

Property	Temperature	Value
Coefficient of thermal expansion	100.0 °C	1.2E-5 1/K
Max service temperature, long		-50 - 0 °C
Specific heat capacity	20.0 °C	430 J/(kg·K)
Thermal conductivity	20.0 °C	38 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	2.8E-7 Ω·m

Chemical properties

Property	Value
Carbon	0.14 - 0.2 %
Chromium	1 - 1.5 %
Manganese	0.95 - 1.3 %
Molybdenum	0.4 - 0.6 %
Nickel	1.2 - 1.5 %
Phosphorus	0.03 %
Silicon	0.2 - 0.35 %
Sulfur	0.015 %
Vanadium	0.03 - 0.08 %

SEW 090-1: High‑Strength S690G1QL Steel – Quenched & Tempered for Superior Wear Resistance SEW 400 X105CrMo17 Soft-Annealed Steel (+A): Superior Hardening and Wear Resistance

Metal