AS/NZS Grade 250 steel
📄 Download AS/NZS Grade 250 Data Sheet (PDF)
What does it mean by grade 250 steel?
What are the benefits of grade 250 steel?
- Cost-effectiveness- it is probably one of the basic mild steel with lower cost.
- Weldability- Grade 250 mild steel is easy to weld.
- Formability- Medium tensile and yield strength with good elongation makes this material easy to form.
WIDTH (mm) : 50mm~4000mm
AVAILABLE PROCESS: Dry, pickled and oiled
|
Tensile Properties (Transverse) |
Thickness (mm) |
||||||
| 5 ≤ t ≤ 8 | 8 < t ≤ 12 | 12 < t ≤ 50 | 50 < t ≤ 80 | 80 < t ≤ 115 | 115 < t ≤ 150 | ||
|
Yield Strength (Mpa) |
Guaranteed Min |
280 | 260 | 250 | 240 | 230 | 230 |
|
Typical |
290 – 480 | 260 – 360 | 260 – 380 | 250 – 370 | 240 – 370 | 240 – 340 | |
|
Tensile Strength (Mpa) |
Guaranteed Min |
410 | 410 | 410 | 410 | 410 | 410 |
|
Typical |
420 – 540 | 420 – 500 | 420 – 510 | 440 – 520 | 440 – 510 | 450 – 510 | |
|
Elong. On 5.65√S0 (%) |
Guaranteed Min |
22 | 22 | 22 | 22 | 22 | 22 |
|
Typical |
23 – 47 | 28 – 45 | 28 – 45 | 28 – 40 | 25 – 38 | 27 – 38 | |
|
HARDNESS |
TYPICAL |
120 – 160BHN |
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|
AVAILABLE THICKNESS |
3mm – 300mm |
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Chemical Composition (Maximum %)*
The chemical composition for Grade 250 steel varies slightly depending on the applicable Australian and New Zealand Standard (AS/NZS 1594 for hot-rolled coils and AS/NZS 3678 for structural steel plates).
| Element | HA250 (AS/NZS 1594) Coil / Thin Plate |
Grade 250 (AS/NZS 3678) Heavy Structural Plate |
|---|---|---|
| Carbon (C) | 0.20% | 0.22% |
| Manganese (Mn) | 1.20% | 1.70% |
| Silicon (Si) | 0.03% (Typical) / 0.35% (Max) | 0.55% |
| Phosphorus (P) | 0.040% | 0.040% |
| Sulfur (S) | 0.030% | 0.030% |
| Aluminium (Al) | 0.10% | 0.100% |
| CEQ (Carbon Equivalent) | 0.39% | 0.39 – 0.44% (Varies by thickness) |
* Note: Values represent guaranteed maximum percentages based on cast/product analysis unless otherwise specified. Carbon Equivalent (CEQ) is based on the IIW formula.
This steel is carbon steel, rather than alloy steel, as it does not contain large amounts of elements – like chromium or molybdenum. Known as ‘low carbon steel’, it typically has from 0.05% to 0.25% carbon content by weight. (It would be classified as cast iron if any more carbon were added.)
With low levels of both carbon and other alloying elements, mild steel has a number of distinct characteristics that make it a beneficial choice of material for a range of applications.
