Steel XAR 400
GB NM400
XAR 400 (NM400 to GB/T 24186) is a quenched-and-tempered abrasion-resistant plate at roughly 360–440 HB (nominal 400 HB, 43 HRC), with 1000 MPa yield, 1250 MPa tensile and 10 % elongation.
Reference datasheet — XAR 400 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-400HB condition
XAR 400 tempers and conditions
XAR 400 is supplied in 4 conditions, soft to hard. QT-400HB is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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 |
Supply forms, finishes and certifications
Ways XAR 400 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
NM400-GBT24186 | NM400 | Certification |
What is XAR 400?
XAR 400 (NM400 to GB/T 24186) is a quenched-and-tempered abrasion-resistant plate at roughly 360–440 HB (nominal 400 HB, 43 HRC), with 1000 MPa yield, 1250 MPa tensile and 10 % elongation. It is the workhorse wear grade for parts that must still be cut, bent and welded, and is stocked as plate for buckets, chutes, hoppers and truck bodies. Cold bend radii run about 3–4× thickness, welding needs low-hydrogen consumables, and service is limited to 250 °C since heat above the tempering temperature removes the hardness. It competes directly with Hardox 400; step up to XAR 500 for more severe abrasion. XAR 400 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). XAR 400 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 92% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
What is XAR 400 used for?
- bucket wear plates
- chutes
- hoppers
- construction equipment
Advantages
- High strength — 1,000 MPa (145 ksi), better than 92% of steel grades
Limitations
- Difficult to machine — 25/100, worse than 93% of steel grades
- Limited ductility — 10%, 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 properties
Typical room-temperature values for XAR 400-QT-400HB; bars are the position among steel grades.
Physical3
XAR 400 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 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 92% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
XAR 400 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 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 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's machinability is poor (25/100, worse than 93% of steel grades); weldability good (60/100); formability fair (40/100).
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. XAR 400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with XAR 400
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.
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 |
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.
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 XAR 400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- NM400
How much does XAR 400 cost?
XAR 400 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.
XAR 400 — frequently asked
What is XAR 400 used for?
XAR 400 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?
XAR 400 has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,250 MPa (181 ksi) — stronger than 92% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is XAR 400 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 93% 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 be welded?
Yes — weldability is rated good (60/100). 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?
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 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?
XAR 400 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.
How much does XAR 400 cost?
XAR 400 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
- 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; 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.