High strength NM400 wear-resistant steel plate

NM400 is a high-strength, abrasion-resistant (AR) alloy steel engineered for environments where extreme friction meets moderate impact.

Balancing a nominal hardness of 400 HBW with exceptional structural integrity, NM400 wear-resistant steel plate serves as the global benchmark for cost-effective wear protection in mining, construction, and heavy manufacturing. Produced under the GB/T 24186 standard, the nomenclature reflects its core identity:

Technical Specifications Of NM400

A. Chemical Composition: The Secret to Longevity

NM400’s performance is not just about Carbon; it is the result of precise micro-alloying.

B. Mechanical Properties

NM400 vs. Hardox 400

For many international buyers, the choice is between the “Original” (Hardox) and the “Value Leader” (NM400).

Economic Analysis

The “Cost per Hour” Metric

Professional procurement managers don’t look at the price per ton; they look at the Cost per Hour of Operation.

Strategic Insight: NM400 wear-resistant steel plate offers the lowest cost-per-hour in the industry, saving up to 60% in lifetime costs compared to standard steel through reduced downtime and fewer replacements.

Engineering & Fabrication Best Practices

Welding (Critical for Performance)

Cutting & Shaping

Primary Applications by Industry

How to Source Real NM400 wear-resistant steel plate

In an era of rising operational costs, NM400 provides 90-95% of the performance of premium European wear plates at 60-70% of the cost. It is the logical choice for industrial applications where durability and profit margins are equally important.

What is NM400 steel?

NM400 Steel is a high-strength, wear-resistant steel known for its superior durability and toughness. NM400 is a Chinese GB standard steel grade. The NM 400 material is widely used in industries where resistance to abrasion is important, such as in the construction and mining sectors.

What is the difference between Hardox 400 and NM400?

Hardox 400 generally contains a higher chromium (Cr) and nickel (Ni) content, which contributes to better hardness and toughness, while NM400 maintains a balance between cost and performance.

What is the difference between AR 400 and NM400?

NM400 offers cost-effectiveness and low-temperature toughness, making it ideal for budget-conscious projects in moderate wear environments. AR400, with its superior impact resistance and formability, excels in high-impact applications requiring complex fabrication.

Can NM400 be reheated or heat-treated during processing?

This is one of the most critical warnings for first-time users. NM400 steel plate must not undergo secondary high-temperature heat treatment. The material achieves its wear resistance through a quenched and tempered (Q+T) process. If reheated to high temperatures-such as flame heating for easier bending-the internal microstructure will be altered, resulting in a permanent loss of hardness and wear resistance.

Additionally, the recommended service temperature for NM400 is generally below 250°C–300°C. Exceeding this range may reduce its mechanical properties unless specially alloyed grades (with elements like Mo or V) are used.

NM400 wear resistant steel plate stock resources in China

Grade	Thk(mm)	W(mm)	L(mm)	Grade	Thk(mm)	W(mm)	L(mm)
NM400	10	2200	8000	NM400	32	2200	8000
NM400	10	2050	5820	NM400	32	2500	6400
NM400	10	2100	6400	NM400	32	2490	8400
NM400	10	1800	6500	NM400	35	2200	6500
NM400	100	2200	8000	NM400	35	2200	6000
NM400	110	2720	5700	NM400	36	3030	4200
NM400	110	2000	9850	NM400	40	2200	8000
NM400	12	2200	8000	NM400	40	2200	12000
NM400	12	2200	10000	NM400	40	2000	5800
NM400	120	2700	6250	NM400	40	2020	12100
NM400	130	2340	8450	NM400	40	2000	8000
NM400	135	2040	7950	NM400	44	1800	7280
NM400	135	2040	8050	NM400	45	2200	8000
NM400	14	2200	8000	NM400	46	2500	6800
NM400	14	2200	10000	NM400	50	2200	8000
NM400	15	2200	12000	NM400	50	2010	7650
NM400	150	2390	10200	NM400	52	2000	4250
NM400	16	2200	8000	NM400	55	2200	10000
NM400	18	3480	9150	NM400	6	2500	12000
NM400	18	2180	12000	NM400	60	2200	8000
NM400	20	2200	8000	NM400	68	2500	11800
NM400	20	2580	7550	NM400	7	2000	8000
NM400	20	2200	9650	NM400	70	2200	12000
NM400	24	1870	10000	NM400	75	2290	13700
NM400	25	2200	8000	NM400	8	2200	8000
NM400	25	2000	8000	NM400	8	2000	7850
NM400	25	2200	12000	NM400	8	2100	10300
NM400	25	2200	11750	NM400	80	2200	8000
NM400	26	2030	8900	NM400	80	2200	10000
NM400	28	1970	8350	NM400	90	2200	8000
NM400	30	2200	8000	NM400	90	2670	4690
NM400	30	2100	7000	NM400	90	2780	4720
NM400	32	2200	12000

Element	Content (%)	Technical Function
C (Carbon)	≤ 0.30	Primary driver of hardness and tensile strength.
Mn (Manganese)	≤ 1.60	Improves hardenability and deoxidizes the steel.
Cr (Chromium)	≤ 1.20	Forms hard carbides to resist abrasive wear.
Ni (Nickel)	≤ 0.70	Crucial for toughness; prevents cracking under impact.
Mo (Molybdenum)	≤ 0.50	Enhances heat resistance and prevents temper brittleness.
Si (Silicon)	≤ 0.70	Enhances yield strength and removes impurities.
P & S	≤ 0.025	Kept ultra-low to ensure weldability and prevent brittle fracture.

Property	Metric Value	Significance
Brinell Hardness	360 – 430 HBW	3x harder than mild steel.
Yield Strength	≥ 900 MPa	High load-bearing capacity without deformation.
Tensile Strength	1100 – 1250 MPa	Resists snapping under extreme tension.
Elongation	≥ 10%	Allows for cold bending and fabrication.
Impact Energy	≥ 24J (-20°C)	Reliable performance in sub-zero climates.

Feature	NM400 (Premium Chinese Mills)	Hardox 400 (SSAB Sweden)
Origin	China (Baosteel, TISCO, NISCO)	Sweden
Hardness Consistency	Excellent (Strict QC)	Industry Gold Standard
Weldability	High (Requires Preheating)	High
Procurement Cost	$750 – $950 / Ton	$1,250 – $1,550 / Ton
Lead Time	2–4 Weeks (High Stock Availability)	8–12 Weeks (Regional Dependent)
Best For	Budget-conscious, high-volume projects.	Specialized, ultra-tight tolerance apps.

Material Grade	Service Life (Avg)	Unit Price (Ref)	Cost per Operating Hour
Standard Carbon Steel	1,500 Hours	$650/ton	$0.43 / hr
NM400 Alloy Steel	5,500 Hours	$900/ton	$0.16 / hr
Hardox 400	6,000 Hours	$1,400/ton	$0.23 / hr