Refined Chemical Composition Design
S890Q adopts a low-carbon and low-impurity formula with carbon content ≤ 0.2%, silicon ≤ 0.8% and manganese ≤ 1.7%. Meanwhile, alloying elements such as chromium, molybdenum, nickel and niobium are added to enhance strength. Both phosphorus and sulfur contents are strictly controlled below 0.025%, effectively reducing the risk of welding cracks and balancing strength with processability.
Flexible and Adaptable Dimensional Specifications
The regular thickness ranges from 6 to 100mm, the width can be customized from 2000 to 3000mm as required, and the maximum length reaches 18800mm. The large-size specifications can reduce the number of splicing processes for large components, improve the overall structural stability, and meet the needs of heavy industry scenarios such as wind power and bridges.
Strict Delivery Technical Requirements
S890Q is delivered in the quenched and tempered condition by default, and the surface is subjected to shot blasting to remove oxide scale and ensure cleanliness. Special requirements such as ultrasonic flaw detection (e.g. EN 10160 standard) and alloying element composition deviation control can be added according to the contract agreement to ensure product compliance.
Excellent Environmental Corrosion Resistance
S890Q performs stably in industrial atmosphere and mild marine corrosion environments. According to the corrosion test in 5% HFAE emulsion, the annual corrosion rate is only 0.36mm. After surface anti-rust treatment, its service life under humid and dusty working conditions can be further extended.
Steels specified in this document possess limited weldability propertiessince steel behavior before and after welding
depends not only on the material, but its dimensions and shapes as wellas operating conditions of goods.
General requirements to arc welding of steels specified herein shall be in line with EN 1011-2.
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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.
