What heat-treated steel products does Baosteel make?

Four families come off Baosteel's hot-rolled heat treatment line: (1) NM wear plate in hardness classes NM360 to NM600; (2) BS ultra-high-strength structural steel from BS800E to BS1300D; (3) BST trailer beam steel — BST900L and BST1000L — for welded trailer main beams; and (4) BP protection steel — BP300 to BP600 — for armored and security applications. Baosteel also lists boiler and pressure vessel grades (Q245R–Q420R and EN/ASME equivalents) in normalizing delivery.

What thickness range is Baosteel NM wear plate available in?

The official BRR handbook lists the heat-treated wear plate program at 2–20 mm in thickness, 900–2,000 mm in width and 4,000–15,000 mm in length (with tighter length ranges on some widths); out-of-range sizes can be negotiated directly with the mill. Baosteel's new continuous heat treatment line extends the wear plate envelope further — down to 1.5 mm, the world's thinnest heat-treated wear plate, and up to 25 mm.

What is the difference between NM400 and NM400E?

The E suffix marks the high-toughness version. Both share the same hardness class (400±30 HBW) and strength (yield ≥960 MPa, tensile ≥1,100 MPa), but impact guarantees differ: standard NM400 guarantees -40 °C KV2 ≥20 J, while NM400E guarantees ≥60 J. The same pattern applies across the family: NM450/NM450E, NM500/NM500E.

What is BST1000L used for?

BST1000L is a 1,000 MPa-class quenched-and-tempered beam steel developed for welded main beams of semi-trailers and special vehicles. Baosteel's documented application: a 2022 lightweight fence-type semi-trailer built with BST1000L beams and high-strength upper-structure steels cut body weight by about 10 % versus mainstream 700 MPa designs, saving over 23 tonnes of CO2 per trailer per year, with yield ≥950 MPa, tensile ≥1,000 MPa and -40 °C impact ≥27 J guaranteed.

Are BW grades still available, or only NM?

Baosteel has renamed the wear plate series from BW to the GB/T 24186 designations: BW360→NM360, BW400→NM400, BW450→NM450, BW500→NM500, BW600→NM600. Older mill certificates showing BW grades come from the same product family and lines — verify by certificate number with the mill. New orders are designated NM.

How do I order these grades for export?

Through an authorized channel with original mill test certificates. As a Baosteel distributor we supply the NM wear plate family, BS high-strength steels and related grades with original certificates per heat, standard export packaging and full documentation (MTC, EPD data on request). Contact us with grade, thickness, width, length and quantity for a current FOB quote.

宝钢热轧热处理产品全牌号矩阵：NM耐磨钢、BS高强钢、BST大梁钢与BP防护钢

Jay Zheng

2026年11月26日

Buyers usually meet Baosteel one product at a time — an NM400 plate here, a BS960E truck part there. But behind those grades sits one hot-rolled heat treatment platform producing four product families, all quenched and tempered on the same advanced thin-plate lines. This reference maps the complete Baosteel heat-treated program — grades, size ranges, key mechanical values and delivery states — from the official BRR hot-rolled heat-treated products handbook. It is the page to bookmark when you need to know what is actually makeable, not just what is stocked.

The program at a glance

Baosteel heat-treated steel families (official BRR handbook program)
Family	Grades	Thickness	Typical applications
NM wear plate (ex-BW)	NM360, NM400/E, NM450/E, NM500/E, NM600	2–20 mm (program); 1.5–25 mm on the new continuous heat treatment line	Dump truck bodies, hoppers, crushers, coal machinery, grabs, mixer drums
BS structural	BS800E, BS900D/E, BS960D/E, BS960HB, BS960LR, BS1100D/E, BS1300D	Thin gauges to ~14 mm and beyond on request	Cranes, aerial platforms, mining machinery, high-strength welded structures
BST beam steel	BST900L, BST1000L	3–12 / 4–12 mm × 900–2,000 mm × 2,000–15,000 mm	Welded trailer main beams, ultra-high-strength profiles
BP protection steel	BP300, BP440, BP500/500T, BP600	2–12 mm × 850/950–1,800 mm × 2,000–12,000 mm	Armored vehicles, cash-in-transit, security doors, safes, helmets
Boiler & pressure vessel	Q245R–Q420R, 16MnDR; EN P235GH–P420NH; ASME SA516 Gr55–70	3–20 mm × 900–2,100 mm × 2,000–15,000 mm, normalized	Boilers, heat exchangers, pressure vessels, spherical tanks

NM wear plate: the core of the program

The NM family (formerly BW — BW400 = NM400, and so on) is specified to GB/T 24186, hardness-class named. Guaranteed values from the handbook:

NM family guaranteed mechanical properties (Baosteel handbook, transverse tensile test)
Grade	Yield ReH min. (MPa)	Tensile Rm min. (MPa)	Elongation A50 min. (%)	Hardness (HBW)	-40 °C impact KV2 (J)	90° bend mandrel
NM360	≥900	≥1,000	≥12	360±30	≥20	d = 5a
NM400 / NM400E	≥960	≥1,100	≥10	400±30	≥20 / ≥60 (E)	d = 6a
NM450 / NM450E	≥1,100	≥1,200	≥7	450±30	≥20 / ≥60 (E)	d = 5a
NM500 / NM500E	≥1,250	≥1,350	≥7	500±30	≥20 / ≥60 (E)	d = 7a
NM600	—	—	—	600±30	—	—

Three engineering notes worth keeping:

The E grades exist for impact. Where standard NM400 guarantees 20 J at -40 °C, NM400E guarantees 60 J — the version to specify for crusher liners, dump bodies under rock impact and any dynamic loading.
Impact test conditions are defined: Charpy V-notch, values correspond to 10×10×55 mm specimens (sub-size values reduce proportionally); plates under 6 mm are not impact-tested; bending is transverse.
The envelope keeps growing. The handbook program lists 2–20 mm, but Baosteel's new continuous heat treatment line runs 1.5–25 mm — including the world's only 1.5 mm heat-treated wear plate, which enables weight savings no competitor can match at the thin end.

BS structural: 800–1,300 MPa welded structures

The BS family covers quenched-and-tempered structural grades from 800 MPa to 1,300 MPa yield-adjacent classes — BS800E through BS1300D — for cranes, aerial work platforms and mining equipment where every kilogram of weldment counts. Carbon equivalents are published per grade (BS960E: Ceq 0.52, Pcm 0.28), and Baosteel publishes full welding data: preheat rules, GMAW heat input limits of 8–12 kJ/cm, and a filler matching table to EN 12534 / AWS A5.28 / its own BH wire series. See our dedicated BS960E welding guide and the data-driven BS960E vs Strenx 960 comparison.

BST beam steel: the lightweight trailer revolution

BST900L and BST1000L are 900/1,000 MPa-class beam steels developed for welded main beams of semi-trailers and special vehicles, delivered quenched and tempered (Q+T):

BST beam steel guaranteed values and size program
Grade	Yield ReH min. (MPa)	Tensile Rm min. (MPa)	Elongation min. (%)	-40 °C impact (J)	Sizes (mm)
BST900L	≥850	≥900	≥8	≥27	3–12 × 900–2,000 × 2,000–15,000
BST1000L	≥950	≥1,000	≥8	≥27	4–12 × 900–2,000 × 2,000–15,000

Baosteel's documented flagship application: a 2022 lightweight fence-type semi-trailer built entirely on BST1000L beams and companion high-strength upper-structure steels (BST1000X side rails, BST850X cross members, BST800HW floor) cut body weight ~10 % versus mainstream 700 MPa designs — saving over 23 tonnes of CO2 per trailer per year. Baosteel's welding guidance for BST1000L: no preheat up to 8 mm at 20 °C; 75 °C preheat above 8 mm; interpass ≤200 °C; GMAW heat input 5–12 kJ/cm, SAW ≤20 kJ/cm.

BP protection steel: 300–600 HB armor grades

For armored and security applications, the BP family spans BP300 (B900FD) through BP600 at 2–12 mm — cash-in-transit vehicles, security doors, bank counters, safes, shields and helmets. Guaranteed hardness values are 300, 440, 500/500T and 600 HB; machining calls for HSS-E or HSS-Co drills and coated-carbide milling cutters, water-jet cutting preserves the ballistic edge performance, and bending radii are specified (BP500 ≥8× thickness, BP440 ≥5× thickness).

Sourcing from the full program

Not every grade is warehoused in every port — but the program above is what the mill can make. As a Baosteel distributor we quote from this full matrix: NM400 / NM450 / NM500 wear plate, BS960E and the wider high-strength range, with original mill test certificates per heat and the complete Baosteel supply program behind it. For sizes outside the listed envelope, the mill accepts negotiated specifications — ask us and we will confirm feasibility with Baosteel directly. Request a quote with grade, thickness, width, length and quantity.