Steel Products
Boron Alloyed Quenched & Tempered Steel
Boron-alloyed steel with high hardenability after heat treatment.
Overview
Material overview
The addition of a small amount of boron (typically 0.0005% – 0.005%) significantly enhances the steel's hardenability, allowing superior hardness and strength after heat treatment without compromising formability in the as-rolled condition.
These steels are commonly supplied in hot-rolled, normalized, or quenched & tempered conditions depending on end-use requirements.
Range
Grades we deal in
28MnB5
30MnB5
Technical data
Specifications & typical properties
Indicative values from our reference catalog — exact grades and dimensions are confirmed against mill test certificates at quotation.
| Form | Plates |
|---|---|
| Delivery conditions | Hot rolled, normalized, quenched & tempered (Q&T), soft annealed |
| Thickness | 3mm – 200mm |
| Width | Up to 2500mm |
| Length | 6000mm – 12000mm |
| Surface condition | Black hot rolled, polished, or machined |
Chemical composition (%)
| Grade | C | Mn | Si | P (max) | S (max) | Cr | B |
|---|---|---|---|---|---|---|---|
| 28MnB5 | 0.26–0.33 | 1.10–1.40 | 0.15–0.35 | ≤ 0.025 | ≤ 0.035 | ≤ 0.30 | 0.0008–0.005 |
| 30MnB5 | 0.27–0.34 | 1.15–1.45 | 0.15–0.35 | ≤ 0.025 | ≤ 0.035 | ≤ 0.30 | 0.0008–0.005 |
Mechanical properties (as rolled)
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Hardness (HBW) |
|---|---|---|---|---|
| 28MnB5 | 350–450 | 550–700 | 18–22 | 170–210 |
| 30MnB5 | 380–480 | 600–750 | 16–20 | 180–220 |
Where it works
Applications
Machinery
Truck bodies
Agriculture equipment
Underground mining
Automotive industry