S690Q(1.8940) Steel Technical Specifications & Summary
Basic Information - Grade: S890Q - Material Number
1.8940 - Classification: Alloy special steel with specified minimum impact energy at temperatures not lower than -20°C - Equivalent Grades: No information
Applicable Standards
1. EN 10025-6:2004: Technical delivery conditions for hot rolled products of structural steels (high yield strength structural steels in quenched and tempered condition)
2. EN 10137-2:1996: Delivery conditions for quenched and tempered plates/wide flats made of high yield strength structural steels
Chemical composition % of steel S890Q (1.8940): EN 10025-6-2004
| Nominal thickness =< 50(mm) CEV max = 0.72 Depending on the thickness of the product and the manufacturing conditions, the manufacturer may add to the steel one or several alloying elements up to the maximum values given in order to obtain the specified properties Nb, Ti, V, Zr: There shall be at least 0.015% of a grain-refining element present. AL is also one of these elements. The minimum content of 0.015% applies to soluble aluminium, this value is regarded as attained if the total aluminium content is at least 0.018%; in case of dispute the soluble aluminium content shall be determined |
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.025 | max 0.015 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.82 |
Mechanical properties of steel S890Q (1.8940)
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| Rm - Tensile strength (MPa) | 940-1100 | 880-1100 |
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| ReH - Minimum yield strength (MPa) | 890 | 830 |
| KV - Impact energy (J) longitud., | 0° 40 |
-20° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 11 |
Heat treatment conditions
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Core Summary of S890Q (1.8940)
S890Q (material number 1.8940) is a quenched-tempered high-yield-strength alloy special steel compliant with standards like EN 10025-6. It features a low-carbon, low-impurity composition (C ≤ 0.2%, CEV ≤ 0.82), balancing strength and processability. Its mechanical properties vary by thickness: yield strength ≥890MPa (3–50mm) or ≥830MPa (50–100mm), tensile strength 880–1100MPa, and impact energy 40J (0°C)/30J (-20°C). It is a common material for heavy-load structural components requiring high strength and low-temperature toughness.
What do the letters and numbers in S890Q mean?
"S" stands for structural steel, "890" is 890MPa yield strength, "Q" means quenched & tempered delivery condition.
What national standard material does S890Q correspond to? Which standard does it follow?
It corresponds to GB Q890 quenched-tempered high-strength steel and follows EN10025-6 European standard.
What are the key welding precautions for S890Q?
Preheat 100-150℃ before welding, use pulse power, and select ER69-G backing wire to prevent cracks.
What are the core mechanical property indicators of S890Q?
Room-temperature tensile strength 940-1100MPa, -40℃ impact energy ≥40J, yield ≥890MPa (thickness ≤50mm).
In which fields is S890Q mainly used?
It's used for engineering machinery arms, wind power flanges, bridge load-bearing parts, coal mine hydraulic supports.