Steel XAR 400 QT-400HB-THICK
Heat-treated state
GB NM400
QT-400HB-THICK = q&T 400 HB heavy gauge
Heavy wear blocks and crusher liners where surface hardness matters more than through-thickness properties.
Values for the QT-400HB-THICK condition
Other XAR 400 tempers and conditions
XAR 400 is listed in 4 conditions; see the grade overview at XAR 400.
- QT-400HB-THICK
- QT-400HB
- XAR-400-W
- QT-400HB-THIN
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
QT-400HB-THICKThis page Q&T 400 HB heavy gauge | Heavy wear blocks and crusher liners where surface hardness matters more than through-thickness properties. | 950 | 1,180 | 10 | 41 HRC | 7 % IACS |
QT-400HBDefault quenched and tempered, 360–440 HB (standard plate 4–100 mm) | Standard stocked condition: pick for general abrasion service on chutes, buckets, liners and tipper bodies. | 1,000 | 1,250 | 10 | 43 HRC | — |
weather-resistant (Cu/Cr-alloyed) wear plate, same 400 HB class | Choose when the wear part is exposed outdoors uncoated and atmospheric corrosion adds to the wear loss. | 1,000 | 1,250 | 10 | 43 HRC | 6.5 % IACS |
Q&T 400 HB thin gauge | Thin quenched plate for tipper liners and wear sheets that must be cold-bent to small radii. | 1,050 | 1,300 | 11 | 43 HRC | 7 % IACS |
What is XAR 400 QT-400HB-THICK?
XAR 400 QT-400HB-THICK is XAR 400 heat treated to QT-400HB-THICK — heavy wear blocks and crusher liners where surface hardness matters more than through-thickness properties. XAR 400 QT-400HB-THICK has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 91% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi). XAR 400 QT-400HB-THICK 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). QT-400HB is the default condition FabDigit quotes; QT-400HB-THICK is available on request or by drawing note.
Advantages
- High strength — 950 MPa (138 ksi), better than 91% of steel grades
Limitations
- Limited ductility — 10%, worse than 91% of steel grades
- Difficult to machine — 28/100, worse than 91% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
XAR 400 QT-400HB-THICK properties
Typical room-temperature values for XAR 400 QT-400HB-THICK; 22 are specific to this condition. Other listed values are XAR 400 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
XAR 400 QT-400HB-THICK 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
XAR 400 QT-400HB-THICK has a yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 91% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
XAR 400 QT-400HB-THICK is rated for continuous service to 250°C (482 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
XAR 400 QT-400HB-THICK 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 XAR 400 QT-400HB-THICK takes about 31 MJ of energy and emits 2.3 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 25%.
Manufacturability6
XAR 400 QT-400HB-THICK's machinability is poor (28/100, worse than 91% of steel grades); weldability fair (50/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with XAR 400 QT-400HB-THICK
Is XAR 400 easy to machine?
Treat as 400 HB Q&T steel: rigid setup, negative-rake coated carbide or CBN, low feed/high stability; drilling needs cobalt or carbide with rigid clamping — waterjet or plasma is usually cheaper than milling.
Can XAR 400 be welded?
Weldable with low-hydrogen consumables (soft 500–700 MPa filler is normal); preheat 100–150 °C for thicknesses above ~20 mm and limit interpass to ~225 °C to avoid HAZ cracking and softening.
Can XAR 400 be formed, bent or molded?
Cold-bendable with min inner radius about 3×t transverse to rolling direction (4×t longitudinal), punch nose aligned across the rolling direction; hot forming is not permitted because it destroys the quench.
What surface finishes work on XAR 400?
Supplied shot-blasted or as-rolled; must be primed/painted for outdoor storage, flame-cut edges should be ground to remove hard/notched zones, and hard-facing overlay can be applied at critical wear spots.
XAR 400 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 max; NM400 per GB/T 24186 allows up to 0.30 | ≤ 0.2 | 0.16 |
| Si | ≤ 0.6 | 0.3 |
| Mn | ≤ 1.6 | 1.2 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.01 | 0 |
| Crhardenability | ≤ 1 | 0.5 |
| Nihigher in heavy gauges for toughness | ≤ 1 | 0.2 |
| Mo | ≤ 0.5 | 0.2 |
| Bboron hardenability treatment | ≤ 0.01 | 0 |
| Fe | balance | — |
XAR 400 QT-400HB-THICK — frequently asked
What is XAR 400 QT-400HB-THICK used for?
XAR 400 QT-400HB-THICK is typically used for bucket wear plates, chutes, hoppers and construction equipment. In short: weldable 400 HB wear plate; formable abrasion grade; hardox 400 class equivalent.
What is the yield strength of XAR 400 QT-400HB-THICK?
XAR 400 QT-400HB-THICK has a typical yield strength of 950 MPa (138 ksi) and a tensile strength of 1,180 MPa (171 ksi) — stronger than 91% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is XAR 400 QT-400HB-THICK easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% of steel grades). Treat as 400 HB Q&T steel: rigid setup, negative-rake coated carbide or CBN, low feed/high stability; drilling needs cobalt or carbide with rigid clamping — waterjet or plasma is usually cheaper than milling.
Can XAR 400 QT-400HB-THICK be welded?
With care — weldability is rated fair (50/100). Weldable with low-hydrogen consumables (soft 500–700 MPa filler is normal); preheat 100–150 °C for thicknesses above ~20 mm and limit interpass to ~225 °C to avoid HAZ cracking and softening.
What surface finishes work on XAR 400 QT-400HB-THICK?
Supplied shot-blasted or as-rolled; must be primed/painted for outdoor storage, flame-cut edges should be ground to remove hard/notched zones, and hard-facing overlay can be applied at critical wear spots.
Can XAR 400 QT-400HB-THICK be formed, bent or molded?
Cold-bendable with min inner radius about 3×t transverse to rolling direction (4×t longitudinal), punch nose aligned across the rolling direction; hot forming is not permitted because it destroys the quench.
What is the maximum service temperature of XAR 400 QT-400HB-THICK?
XAR 400 QT-400HB-THICK is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- XAR wear-resistant steel plate data sheet (XAR 400 / 400 W) — thyssenkrupp Steel Europe (2022)
- GB/T 24186 Wear-resistant steel plate and strip for engineering machinery (NM400) — SAC / (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.