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Hot Rolled Coil/Plate

Hot-rolled coil has excellent properties such as high strength, good toughness, easy processing and good weldability, so it is widely used in shipbuilding, automobile, bridge, construction, machinery, pressure vessel and other manufacturing industries. Common materials are Q235B, Q345B, SPHC, 510L, Q345A, Q345E, etc. Ganghua Steel produces and sells various styles of hot rolled coils/plates, and accepts product customization. We have 12 years of production experience, attach importance to product quality, provide high-quality services, and are committed to bringing customers the best cooperation experience.

Classification of hot rolled coils

Hot-rolled coils can be divided into: straight hair coils and finishing coils (divided coils, flat coils, slit coils);
According to different materials and properties, it can be divided into: ordinary carbon structural steel, low alloy steel, alloy steel;
According to different uses, it can be divided into: cold forming steel, structural steel, automobile structural steel, corrosion-resistant structural steel, mechanical structural steel, welded gas cylinder and pressure vessel steel, pipeline steel, etc.

Corresponding grades and uses of different types of hot rolled coils

Type	International Standard Number	Grade	Use
Hot rolled mild steel	JIS G3131	SPHC	Suitable for manufacturing cold-formed parts.
		SPHD
		SPHE
	DIN 1614（EN10111）	STW22(DD11)
		STW23(DD12)
		STW24(DD13)
General structural steel	JIS G3101	SS 330	For general structural parts such as buildings, bridges, ships, vehicles, etc.
		SS 330
		SS 490
		SS 540
	DIN 17100 (EN10025)	St 33(S185)
		St 37-2(S235JR)
		St 37-3(S235JO)
		St 44-2(S275JR)
		St 50-2(E295)
		St 52-3(S355JO)
Welded structural steel	JIS G3106	SM400A	Used for structural parts that require excellent welding performance such as buildings, bridges, ships, vehicles, oil tanks, construction machinery, etc.
		SM400B
		SM400C
		SM490A
		SM490B
		SM490C
		SM490YA
		SM490YB
		SM520B
		SM520C
	NSC	Welten590RE	Weldable high-strength steel plates for pressure vessels, oil tanks, construction machinery, mining machinery, pressure water pipes, etc.
Steel for mechanical structures	DIN 17200	C22	For mechanical structural parts used after cutting and other processing and heat treatment.
	JIS G4501	C35
	——	S20C
Fine grain structural steel	DIN 17102	StE255	Fine grain structural steel suitable for welding.
		StE355
Steel strip for steel pipe	JIS G3132	SPHT1	For welded steel pipes.
		SPHT2
		SPHT3
Steel for automobile structure	JIS G3113	SAPH 310	Used for automotive structural parts such as automotive frames and wheels that require formability and processability.
		SAPH 370
		SAPH 410
		SAPH 440
	SEW 092 (EN10149-2)	QStE 340TM（---）	Hot-rolled pellet steel for cold deformation, used for structural parts such as automobile girders that require good cold forming properties and have high or high strength requirements.
		QStE 380TM（---）
		QStE 420TM（S420MC）
		QStE 380TM（S460MC）
		QStE 500TM（S500MC）
Steel for boilers and pressure vessels	DIN 17155 (EN10028-2)	HII (P265GH)	In addition to guaranteeing normal temperature performance, it also guarantees mechanical properties at higher temperatures, suitable for steam boiler equipment, pressure vessels with higher working temperature and similar structural parts.
		19Mn6(P355GH)
	JIS G3103	SB410
	JIS G3116	SG295	Welded steel plates for gas cylinders.
		SG325
Steel for hull structure	LR,BV	A	Available according to national specifications.
	GL,DNV	B
	ABS	D
Atmospheric corrosion resistant steel	SEW087 (EN10155)	WTSt37-2(S235J2W)	It is used to manufacture structural parts that require resistance to atmospheric corrosion, such as containers, railway vehicles, oil derricks, and construction machinery.
		WTSt52-3(S355J2G1W)
	NSC	NAW 400
		NAW 490
Sulfuric acid corrosion resistant steel		S-ten2	Containers for the manufacture of hydrogen sulfide-containing media, etc.
Seawater corrosion resistant steel		Mariloy G41A	Used for structural parts such as oil production platforms, ships, seaport buildings, etc.
		Mariloy S50A
Case hardened steel	DIN 17210	C10	High-purity low-carbon steel is used for surface carburizing or nitriding and then quenching and hardening to manufacture structural parts with high hardness on the surface, wear resistance and high toughness in the core.
		C15
	JIS G4051	S09CK
		S15CK
High toughness pipeline steel	API 5L	X60	For the production of spiral welded pipes, high toughness pipeline steel for oil pipelines, hot-rolled wide-band steel.
		X70
Steel for straight seam welded casing	API 5CT	J55	For manufacturing straight seam welded oil casing.
Hot rolled coil for pipeline	API 5L	Grade A,B	Oil and gas pipelines.
		X42,X46,X52
		A56,X60,X65
		X70

The difference between hot rolled coil and hot rolled sheet

Hot-rolled coils, are strips made of slabs (mainly continuous casting slabs) as raw materials, which are heated by rough rolling mills and finishing mills. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to a set temperature by laminar flow, and is rolled into a steel strip coil by a coiler.
Hot-rolled sheet, is made of cooled steel strip coils. According to the different needs of users, through different finishing lines (leveling, straightening, cross-cutting or slitting, inspection and weighing, packaging and signs, etc.) to be processed into steel plates, flat rolls and slit steel strip products.

Hot rolled coil/plate production process

Advantages of HRC

Hot rolling can destroy the casting structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; the bubbles, cracks and porosity formed during casting can also be welded under the action of high temperature and pressure. Therefore, the hot rolled coil has excellent properties such as high strength, good toughness, easy processing and good weldability.

Epilogue

Ganghua Steel focuses on the production of carbon steel products, providing you with high-quality hot-rolled sheets, hot-rolled coils and other types of carbon steel products and high-quality services, looking forward to becoming a forever partner with you! We have experienced technicians and a complete production line, which can provide services such as cutting and product customization. Welcome to communicate with us!

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