Types of carbon steel and their properties
Carbon steel can be classified into three categories according to its carbon content: low-carbon steel (or mild-carbon steel), medium-carbon steel and high-carbon steel . Their carbon content, microstructure and properties compare as follows:
| Carbon content (wt.%) | Microstructure | Properties | Examples |
| Low-carbon steel | < 0.25 | Ferrite, pearlite | Low hardness and cost. High ductility, toughness, machinability and weldability |
| Medium-carbon steel | 0.25 – 0.60 | Martensite | Low hardenability, medium strength, ductility and toughness |
| High-carbon steel | 0.60 – 1.25 | Pearlite | High hardness, strength, low ductility |
PRODUCT DETAILS
| Q235B Low Carbon Steel Coil |
Q235B hot rolled carbon steel coil is a universal structural HRC grade matching ASTM A36, EN S235JR and JIS SS400 mechanical standards. Balanced yield strength, stable room-temperature impact resistance and outstanding all-around fabricability make it a multi-purpose raw coil for industrial frames, factory buildings and welded pipe production. Mass factory stock supports custom slitting and bulk wholesale for global structural metal manufacturers. Haiwo steel group supplies full grades of high quality carbon steel coil products at competitive factory price, inquire us now! |
| Product
Parameters |
|
| Product
Name | Q235B Low Carbon Steel Coil |
| Production
Process | Hot Rolling,
Cold Rolling |
| Material
Standards | GB/T 700 Q235B; Equivalent: ASTM A36, EN 10025 S235JR, JIS G3101 SS400 |
| Regular Size | Common Thickness Range 1.5mm – 16mm; mainstream gauges: 2.75/3.0/4.0/5.75/8/10/12/14mm Standard Coil Width 900/1000/1250/1500/1800mm, custom slit narrow strip 10–1800mm available |
| Surface Treatment | Original hot rolled black oxide finish Pickled & oiled surface for better painting adhesion Light anti-rust oil coating for long-sea transit storage Edge deburring after slitting service on request |
| Delivery Temper | Hot rolled as-rolled; normalized treatment optional for thick coils over 12mm |
| Full Supporting Certificates | EN 10204 3.1 Mill Test Certificate, SGS/BV tensile, bending & impact test report, chemical composition inspection certificate, UT ultrasonic test document, CE certification available for EU export shipments |
| Exported to | Vietnam, Thailand, Malaysia; Saudi Arabia, UAE; Mexico; India, Egypt, South Africa |
| Core Strengths |
Standardized 235MPa yield strength with stable 20℃ impact performance, reliable for medium-load structural projects Perfect cross-brand interchangeability with A36, S235JR, SS400, eliminates material matching barriers for global buyers Balanced ductility & rigidity, smooth welding, bending and punching without extra heating treatment Broad thickness range covers light stamping to heavy structural fabrication, one-stop raw material for multi-line factories Stable continuous rolling surface, consistent dimensional tolerance for automated slitting & tube forming lines Cost competitive universal structural grade with abundant spot inventory for large-scale project orders |
| Scope of Application |
Industrial factory steel frames, warehouse roof & wall structural supports ERW welded pipe, square/rectangular tube base blank for construction pipelines Mechanical equipment base brackets, platform panels and light structural components Cold rolled coil substrate, stamped metal fittings and general engineering blanks Temporary construction frames, guardrail raw stock and greenhouse main frames |
