Steel Q890Q
GB Q890Q · EN S890Q
Q890Q is a quenched and tempered high-strength structural plate to GB/T 16270, matching EN S890Q, with 950 MPa yield, 1000 MPa tensile, 14% elongation and about 320 HB (34 HRC).
Reference datasheet — Q890Q is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the QT condition
Q890Q tempers and conditions
Q890Q is supplied in 5 conditions, soft to hard. QT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Q&T heavy plate | Thick-section plate; lower guaranteed yield due to reduced through-thickness quench severity. | 880 | 950 | 14 | 31 HRC | 7 % IACS |
Stress relieved | Used after heavy welding or machining of thick weldments; slightly lowers strength. | 910 | 970 | 15 | 32 HRC | 7 % IACS |
QTDefault Quenched and tempered | Standard stocked condition for crane booms and machinery structures in normal climates. | 950 | 1,000 | 14 | 34 HRC | 7 % IACS |
Q&T, low-temperature impact class | Choose for cold-climate cranes and offshore-adjacent structures needing −40 °C toughness. | 950 | 1,000 | 14 | 34 HRC | 7 % IACS |
Q&T, extra-low-temperature impact class | Highest toughness class of the family, for arctic service and critical fracture-controlled joints. | 950 | 1,000 | 15 | 33 HRC | 7 % IACS |
What is Q890Q?
Q890Q is a quenched and tempered high-strength structural plate to GB/T 16270, matching EN S890Q, with 950 MPa yield, 1000 MPa tensile, 14% elongation and about 320 HB (34 HRC). It is used for crane booms and heavy structural fabrications and is available as plate in QT, thickness-banded QT 50–100 mm, low-temperature QL and QL1, and stress-relieved SR conditions. Fabrication is more demanding than Q690Q: preheat and heat-input control are mandatory, cold bend radii grow to 3–4t, and the plate has no corrosion resistance. Q690Q is easier to weld; Q960Q gives more strength. Q890Q has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). Q890Q has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 91% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
What is Q890Q used for?
- crane booms
- structural fabrications
- heavy machinery
Advantages
- High strength — 950 MPa (138 ksi), better than 91% of steel grades
Limitations
- Difficult to machine — 33/100, worse than 86% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
- Poor heat conductor — 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 75% of steel grades
Q890Q properties
Typical room-temperature values for Q890Q-QT; bars are the position among steel grades.
Physical3
Q890Q has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
Q890Q has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 91% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
Q890Q is rated for continuous service to 350°C (662 °F). It conducts heat at 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 75% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
Q890Q conducts electricity at 7 % IACS, worse than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of Q890Q takes about 31 MJ of energy and emits 2.3 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 25%.
Manufacturability8
Q890Q's machinability is poor (33/100, worse than 86% of steel grades); weldability good (60/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. Q890Q is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Q890Q
Is Q890Q easy to machine?
Machine like 320 HB Q&T alloy steel: rigid setups, coated carbide, moderate speeds (~80–120 m/min) with generous feed and coolant; avoid rubbing that work-hardens the surface.
Can Q890Q be welded?
Weldable with low-hydrogen SMAW/MAG/SAW using matching or slightly undermatching consumables; preheat typically 100–175 °C by thickness/CEV, interpass ≤200 °C, control heat input (≈1.0–2.5 kJ/mm) to protect HAZ toughness — no post-weld normalizing.
Can Q890Q be formed, bent or molded?
Cold bendable with punch radius ≥3–4× thickness transverse to rolling direction; deburr and grind flame-cut edges before bending, hot forming above the tempering temperature destroys the Q&T properties.
Q890Q chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cladle analysis | ≤ 0.2 | 0.16 |
| Si | ≤ 0.8 | 0.3 |
| Mn | ≤ 1.7 | 1.2 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | ≤ 1.5 | 0.6 |
| Ni | ≤ 2 | 0.8 |
| Mo | ≤ 0.7 | 0.4 |
| Cu | ≤ 0.5 | 0.15 |
| V | ≤ 0.12 | 0.04 |
| Nb | ≤ 0.06 | 0.03 |
| Ti | ≤ 0.05 | 0.02 |
| Bhardenability booster | ≤ 0.01 | 0 |
| Zr | ≤ 0.05 | |
| N | ≤ 0.02 | 0.01 |
| Altotal Al, or other N-binding element | ≥ 0.02 | 0.03 |
| Fe | balance |
What surface finishes work on Q890Q?
Shot-blast to Sa 2½ and apply zinc-rich epoxy primer or metallizing; hot-dip galvanizing and electroplating are risky due to hydrogen embrittlement at this strength level.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel Q890Q in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- S890Q
How much does Q890Q cost?
Q890Q is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Q890Q — frequently asked
What is Q890Q used for?
Q890Q is typically used for crane booms, structural fabrications and heavy machinery. In short: mid-range 890 MPa Q&T; S890Q equivalent; QL and QL1 toughness options.
What is the yield strength of Q890Q?
Q890Q has a typical yield strength of 950 MPa (138 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 91% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is Q890Q easy to machine?
Not especially — machinability is rated poor (33/100, worse than 86% of steel grades). Machine like 320 HB Q&T alloy steel: rigid setups, coated carbide, moderate speeds (~80–120 m/min) with generous feed and coolant; avoid rubbing that work-hardens the surface.
Can Q890Q be welded?
Yes — weldability is rated good (60/100). Weldable with low-hydrogen SMAW/MAG/SAW using matching or slightly undermatching consumables; preheat typically 100–175 °C by thickness/CEV, interpass ≤200 °C, control heat input (≈1.0–2.5 kJ/mm) to protect HAZ toughness — no post-weld normalizing.
What surface finishes work on Q890Q?
Shot-blast to Sa 2½ and apply zinc-rich epoxy primer or metallizing; hot-dip galvanizing and electroplating are risky due to hydrogen embrittlement at this strength level.
Can Q890Q be formed, bent or molded?
Cold bendable with punch radius ≥3–4× thickness transverse to rolling direction; deburr and grind flame-cut edges before bending, hot forming above the tempering temperature destroys the Q&T properties.
What is the maximum service temperature of Q890Q?
Q890Q is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Q890Q-QT and Q890Q-SR?
QT is the default condition — standard stocked condition for crane booms and machinery structures in normal climates. SR: used after heavy welding or machining of thick weldments; slightly lowers strength. Yield strength is 950 MPa in QT versus 910 MPa in SR.
How much does Q890Q cost?
Q890Q is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10025-6 Hot rolled products of structural steels — Flat products of high yield strength structural steels in the quenched and tempered condition — CEN (2019)
- High-strength quenched & tempered structural plate (S890Q class) data sheets — SSAB / Dillinger / Baosteel (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.