S960Q is a quenched and tempered high - yield - strength structural steel that complies with the European standard EN 10025 - 6. It is a key material in high - end equipment manufacturing and large - scale engineering due to its excellent comprehensive properties.
| Grade : | S960Q | ||
| Number: | 1.8941 | ||
| Classification: | Alloy special steel with specified minimum values of impact energy at temperatures not lower than -20 °C | ||
| Standard: |
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| Equivalent grades: | No information |
Chemical composition % of steel S960Q (1.8941): EN 10025-6-2004
| 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 S960Q (1.8941)
| Nominal thickness (mm): | 3 - 50 |
| Rm - Tensile strength (MPa) | 980-1150 |
| Nominal thickness (mm): | 3 - 50 |
| ReH - Minimum yield strength (MPa) | 960 |
| KV - Impact energy (J) longitud., | 0° 40 |
-20° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 10 |
What do the letters and numbers in the S960Q grade represent, and which standard does it comply with?
S960Q conforms to the European standard EN 10025-6. "S" denotes structural steel, "960" indicates a minimum yield strength of 960MPa for plates ≤50mm thick, and "Q" means it is delivered in a quenched and tempered state-this heat treatment is key to its balanced strength and toughness .
What are the core chemical and mechanical properties that define S960Q's performance?
Chemically, it uses a low-carbon design (C≤0.20%) with strict impurity control (P≤0.025%, S≤0.015%) and adds Cr, Ni, Mo for hardenability, plus Nb/Ti for grain refinement . Mechanically, it has a tensile strength of 980–1150MPa, elongation ≥10%, and maintains ≥30J impact energy at -20°C, balancing high strength and low-temperature resilience .
What welding and cutting processes are suitable for S960Q, and what precautions are needed?
Welding requires preheating ≥120°C for plates >30mm, matching low-hydrogen weld materials, and post-weld hydrogen elimination treatment (250°C×2h) to avoid heat-affected zone embrittlement . For cutting, plates ≤20mm use laser/plasma cutting, while >30mm need temperature-controlled flame cutting followed by hardened layer grinding .
How does S960Q's performance change with thickness, and what are its typical application scenarios?
Its yield strength is ≥960MPa for 3–50mm plates, dropping to ≥850MPa for 50–100mm, but tensile strength remains stable SSAB. It is widely used in 100+ ton mining truck floors, crane booms, high-rise building core tubes, and offshore platform structural parts, enabling lightweight design under heavy loads .
What is the difference between S960Q and S960QL, and how to choose between them?
The core gap is low-temperature toughness: S960Q only guarantees performance at -20°C, while S960QL (with "L" for low temperature) meets ≥30J impact energy at -40°C . Choose S960Q for temperate high-load scenarios (e.g., temperate-region construction machinery) and S960QL for frigid environments (e.g., cold-sea offshore platforms) .