SPCD Steel

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional spcd steel manufacturers and suppliers in China. Welcome to wholesale customized spcd steel at competitive price from our factory. Good service and quality products are available.

A steel grade of spcd Japan Steel (JIS standard series), which represents cold-rolled carbon steel sheets and steel strips for stamping, equivalent to China's 08AL (13237) high-quality carbon structural steel.

Cold-rolled carbon steel plate and steel strip quenching and tempering code: annealing state is A, standard quenching and tempering is S, 1/8 hardness is 8, 1/4 hardness is 4, 1/2 hardness is 2, full hardness is 1. Surface processing Code: D for matte finish rolling and B for bright finish rolling. For example, SPCC-SD represents standard tempered and finished-rolled general-purpose cold-rolled carbon plate.

SPCD steel chemical composition :

SPCD steel Mechanical Properties

Cold rolled steel SPCD

Cold rolled steel SPCD Coil

Cold rolled steel is manufactured in the following steps:

1. Iron surface cleaning process
The descaling line performs the cleaning of hot rolled coils. The coils are treated in a special cleaning tank using hydrochloric acid (HCL at a temperature of 60-700°C) to ensure that the oxide layer on the corrugated iron surface is removed before being sent to the cold rolling stage. The manufacturer's special cleaning agent tank contains a relatively small amount of cleaning agent to ensure fast cleaning speed, high cleaning efficiency and high production efficiency. In addition, the production line is also equipped with a tandem pressure spray cleaning system to ensure that the chloride remaining on the steel surface after pickling is cleaned. And protect the clean surface with the special surface protectant NaNO2.

2. Cold rolling process
– The cold rolling equipment of GNEE Steel equipped with 4 continuous rolling lines, the thickness and flatness of steel coils are controlled by a modern thickness gauge when each coil passes through, to ensure accurate thickness and smooth surface. The automatic control system (including peripheral equipment and processing software) ensures that the tension between the frames is synchronized and the process is stable.

– The number of rolls required by the rolling mill depends on the thickness of the hot-rolled coil and the thickness of the cold-rolled coil. Typically 50% - 60% distortion, up to 80%. To achieve good quality in terms of microbiological and physico-mechanical properties.

3. Soft Annealing Stage
– After cold rolling, the surface of the rolled coil is hardened. In order to rebuild the grain structure, achieve complete mechanical properties and a bright surface, the coil will be annealed in an electric annealing furnace in a protective gas atmosphere. The annealing line has the very important feature of operating in a 100% hydrogen protected coil environment. Therefore, the annealed coil will have a uniform quality and a higher annealing rate due to the higher thermal conversion. Reduce post-rolling hardening, increase toughness, and reduce product hardness.

4. Inspection and control of production process
The quality of each coil of GNEE steel is checked and controlled at every stage, throughout the production process until the finished product. The geometry and surface state of the coils are tightly controlled.

Our factory equipped with a quality control department and inspection department checks and balances each other, so every single coil before leaving out of factory will be inspected at least twice, let clients assured and satisfied.

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