Steel NM360
also Hardox 400
NM360 is a quenched and tempered abrasion-resistant plate to GB/T 24186 with a nominal hardness of 360 HB (38 HRC), 1000 MPa yield, 1200 MPa tensile and 11% elongation; it is the domestic counterpart to Hardox 400.
Reference datasheet — NM360 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 Q&T condition
NM360 tempers and conditions
NM360 is supplied in one standard condition, Q&T. Q&T is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways NM360 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Q&T-HEAVY | Q&T heavy gauge | Surface finish |
Q&T-THIN | Q&T thin gauge | Surface finish |
Q&T-LT | Q&T with low-temperature impact guarantee | Certification |
What is NM360?
NM360 is a quenched and tempered abrasion-resistant plate to GB/T 24186 with a nominal hardness of 360 HB (38 HRC), 1000 MPa yield, 1200 MPa tensile and 11% elongation; it is the domestic counterpart to Hardox 400. Its low carbon equivalent gives the best weldability (65) and formability (40) in the wear-plate family, so it suits liners and chutes that are welded or bent in the shop. Machinability is low (30) and maximum service temperature is 250 °C. NM450 is the next step up where abrasion is severe. NM360 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). NM360 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 92% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi).
What is NM360 used for?
- dump truck liners
- conveyor chutes
- general wear parts
Advantages
- High strength — 1,000 MPa (145 ksi), better than 92% of steel grades
Limitations
- Limited ductility — 11%, worse than 89% of steel grades
- Difficult to machine — 30/100, worse than 89% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
NM360 properties
Typical room-temperature values for NM360-Q&T; bars are the position among steel grades.
Physical3
NM360 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
NM360 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 92% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
NM360 is rated for continuous service to 250°C (482 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
NM360 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 NM360 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability6
NM360's machinability is poor (30/100, worse than 89% of steel grades); weldability good (65/100); 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. NM360 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with NM360
Is NM360 easy to machine?
Machine with rigid setups and coated carbide or CBN at low speed and generous feed; drilling needs high thrust or pre-drilling by plasma/EDM, and grinding is often preferred for finishing.
Can NM360 be welded?
Low carbon equivalent gives good weldability with low-hydrogen consumables; preheat ~100–150 °C above ~20–30 mm, limit interpass heat input to avoid softening the HAZ, and do not post-weld heat treat above the tempering temperature.
Can NM360 be formed, bent or molded?
Cold-bend transverse to rolling direction with a minimum inside radius of about 3–4× thickness and generous die opening; hot forming is not recommended because it destroys the quenched hardness.
NM360 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 |
|---|---|---|
| Ckept low for weldability; ladle analysis per GB/T 24186 | ≤ 0.24 | 0.18 |
| Si | ≤ 0.7 | 0.3 |
| Mn | ≤ 1.7 | 1.3 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Crhardenability addition, mill-optional | ≤ 1 | 0.4 |
| Niused mainly for low-temperature toughness options | ≤ 0.5 | 0.15 |
| Mo | ≤ 0.4 | 0.15 |
| Bboron treatment for through-hardening | ≤ 0 | 0 |
| Nb+V+Timicroalloying, sum, mill-optional | ≤ 0.15 | 0.05 |
| Fe | balance |
What surface finishes work on NM360?
Supplied shot-blasted/descaled; abrasive-blast then epoxy prime and paint for outdoor service — no electroplating on hardened plate (hydrogen embrittlement risk).
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 NM360 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Hardox 400
How much does NM360 cost?
NM360 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
NM360 — frequently asked
What is NM360 used for?
NM360 is typically used for dump truck liners, conveyor chutes and general wear parts. In short: most weldable wear plate; hardox 400 alternative; formable 360 HB grade.
What is the yield strength of NM360?
NM360 has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 92% of steel grades.
Is NM360 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 89% of steel grades). Machine with rigid setups and coated carbide or CBN at low speed and generous feed; drilling needs high thrust or pre-drilling by plasma/EDM, and grinding is often preferred for finishing.
Can NM360 be welded?
Yes — weldability is rated good (65/100). Low carbon equivalent gives good weldability with low-hydrogen consumables; preheat ~100–150 °C above ~20–30 mm, limit interpass heat input to avoid softening the HAZ, and do not post-weld heat treat above the tempering temperature.
What surface finishes work on NM360?
Supplied shot-blasted/descaled; abrasive-blast then epoxy prime and paint for outdoor service — no electroplating on hardened plate (hydrogen embrittlement risk).
Can NM360 be formed, bent or molded?
Cold-bend transverse to rolling direction with a minimum inside radius of about 3–4× thickness and generous die opening; hot forming is not recommended because it destroys the quenched hardness.
What is the maximum service temperature of NM360?
NM360 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does NM360 cost?
NM360 is a budget-cost steel ($), 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
- Hardox 400 wear plate data sheet (comparison grade) — SSAB (2023)
- 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.