Cold Rolled Black / Blue Bake Coated Polished High Carbon Spring Steel Strip for Roller Shutter Doors

Product Description

Product Description

Delivery status	Dimension	Surface
1.Cold rolling	1.thickness:0.1-8mm	Bright/polished/blue/polished blue/yellow
2.Cold rolling + annealing	2.breadth:6-450mm
3.Cold rolling + quenching + tempering	3.Inside diameter:Φ300-800mm

Cold rolled strip steel

Cold-rolled steel strip is a thin and wide steel product produced by cold-rolling process. It has the characteristics of high dimensional accuracy, smooth surface and excellent mechanical properties. It is widely used in automobiles, household appliances, construction, machinery manufacturing and other fields. The following is a detailed introduction to cold-rolled steel strip:
  1. Production process of cold-rolled steel strip

   Raw material: Hot-rolled steel coils (thickness 2.0~6.0mm) are usually used as blanks.

   Pickling: Remove the iron oxide sheet on the surface of the hot-rolled coil.

   Cold rolling: It is rolled many times by the rolling mill at room temperature to make the steel strip reach the target thickness (usually 0.2~3.0mm), accompanied by
   processing hardening in the process.       

   Annealing: Eliminate internal stress and improve plasticity, which is divided into continuous annealing and hood annealing.

   Fining: flattening, cutting, splitting, etc., to ensure the size and surface quality.

2. Classification of cold-rolled steel strip by material:

- Low-carbon steel strip (SPCC, DC01, etc.): general-purpose type, used for stamping and bending.

- High-strength steel strip (DP steel, TRIP steel, etc.): automobile structural parts.

- Stainless steel strip (304, 430, etc.): corrosion-resistant scene.

- Surface treatment:

- Galvanized (GI), tin-plated (ETL), color coating (PPGI), etc.

- by purpose:

- Stamping steel strip, electrician steel strip (silicon steel), packaging steel strip, etc.
3. Main performance indicators

- Thickness tolerance: ±0.02~0.05mm (high-precision requirements).

- Surface roughness: Ra≤0.5μm (gloss surface) or customized texture.

- Mechanical performance:

- Tensile strength (300~1000MPa).

- Extension rate (10%~40%).

- Hardness: HRB 40~90 (depending on the annealing state).

 4. Application field

- Automotive industry: body panels, structural parts (high-strength steel).

- Home appliances: refrigerator, air conditioner shell (galvanized plate, color coated plate).

- Electronic appliances: chassis, heat sink (precision thin strip).

- Construction: light steel keel, decorative materials.

- Packaging: cans, metal containers (tin-plated plates).

Detailed Photos

Product Parameters

High quality carbon steel strip:S35C, S45C, S50C, S60C, S70C, S75C, 40Mn, 42Mn, 65Mn, CK67

Carbon tool steel strip: SK4, SK5, SK85, SK7, T10A

Alloy steel strip: SK551, 75Cr1, 50CrVa, 51CrV4, 30CrMo

Spring steel tape: 62Si2Mn, 60Si2Mn

Plain carbon steel: Q235B, Q345B, SPHC SPCC

Imported material:115WB

CHINA GB/T	USA ASTM	JAPAN JIS	GERMANY DIN	FRANCE NF	BIRTAIN BS	ISO	KOREA KS	TAIWAN CNS
45	1045	S45C	CK45	XC45		C45
50	1050	S50C	CK50	XC50	080M50	C50
60	1060	S60C	CK60	XC60	060A62	C60
70	1070	S70C	CK70	XS70		S70
75	1075	S75C	CK75	XC75		C75
T10	W1-9	SK4
T9	W1-8	SK5
SK85	---	SK85
40Mn	1043	SWRH42B	40Mn4	40M5	080A40	SL,SM
42Mn
65Mn	1566	S60C-CSP	CK67		080A67	C60E4
55Si2Mn	9255	SUP 6 SUP7	55Si7	55Si7	251H60	55SiCr7
60Si2Mn	9260	SUP 6 SUP7	65Si7	65Si7	251H60	61SiCr7	SUP3	SUP6
62Si2Mn
75Cr1		75Cr1	75Cr1	75Cr1
51CrV4	5160	SUP9A	51CrV4	51CrV4			SPS5A	SUP9A
30CrMo	G41300	SUP13	35CrMo4				SPS9	SUP13
50CrVA	6150	SUP10	51CrV4	51CrV4	735A51	51CrV4	SPS6	SUP10

Standard	Level	Chemical composition(%)
		C	Si	Mn	P	S	Cr	Ni	Cu
GB/T699	45	0.42~0.50	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	50	0.47~0.55	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	55	0.52~0.60	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	60	0.57~0.65	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	65	0.62~0.70	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	70	0.67~0.75	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	75	0.72~0.80	0.17~0.37	0.50~0.80	0.035	0.035	0.25	0.3	0.25
GB/T699	Mn40	0.37~0.44	0.17~0.37	0.70~1.00	0.035	0.035	0.25	0.3	0.25
GB/T699	Mn45	0.42~0.50	0.17~0.37	0.70~1.00	0.035	0.035	0.25	0.3	0.25
GB/T699	Mn65	0.62~0.70	0.17~0.37	0.90~1.20	0.035	0.035	0.25	0.3	0.25
GB/T1298	SK85/S K5	0.80 ~0.90	≤0.35	≤0.50	0.03	0.03	0.2	0.25	0.3
GB/T1298	SK4	0.95~1.04	≤0.35	≤0.40	0.035	0.03	0.25	0.2	0.3
GB/T3077	51CrV4	0.47~0.55	0.17~0.37	0.80~1.10	0.035	0.035	0.90~ 1.20	0.3	0.3	V
GB/T3077	50CrVA	0.47~0.54	0.17~0.37	0.50~0.80	0.025	0.025	0.80~ 1.10	0.3	0.3	0.10~0.20
GB/T3077	75Cr1	0.7~0.8	0.25~0.5	0.50~0.70	0.035	0.035	0.30~ 0.40			0.10~0.20
GB/T1222	55Si2Mn	0.52~0.60	1.50~2.00	0.60~0.90	≤0.035	≤0.035	≤0.35	≤0.35	≤0.25
GB/T1222	60si2Mn	0.56~0.64	1.50~2.00	0.60~0.90	≤0.035	≤0.035	≤0.35	≤0.35	≤0.25

Application

CAPACITY OF PRODUCTION

Packaging & Shipping

Company Profile

Jinan Taigang new material Co., LTD is a professional steel company engaged in the research, development, production, sale and service. It had five branch companies. Our annual sales nearly one billion, about 280, 000 tons steel, It is located in Jinan with the convenient transportation access. In line with the development concept of quality conquer the world, service achievement future. We dedicate to strict quality control and thoughtful customer service, and our experienced staff members are always available to discuss your requirements and ensure every customer satisfaction. Our main products include PPGI, galvanized steel, steel plate, round bar, steel pipe, Stainless steel product, angle bar, steel pile, H beam, I beam, angle, Channel flat steel etc. With double guarantee of service and management system. Main market distributes in North America, South America, Africa, Southeast Asia as well as Oceania. We have established long-term and win-win partnership with many large steel manufacturers, such as Baosteel, Laiwu Steel, Rizhao Steel, Handan Iron and Steel, Angang and Maanshan Iron and Steel. We always foucesed on the intergration of reasources, in line with the concept of win win cooperation. Sincerely wish to build a long and regular business with you forever.

FAQ

Q1:Does the product have quality inspection before loading?
A1:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.weaccept the third party inspection absolutely.
 
Q2:How do we trust your company?
A2:We are a large factory with an area of 2260000 square meters.
 
Q3 : What is your payment terms ?
A3 : T/T,L/C AT SIGHT,D/P IS WORKABLE AFTER OUR INVESTIGATION
 
Q4:Can I get samples before order ?
A4:Yes, of course. Usually our samples are free,we can produce by your samples or technical drawings.
 
Q5: Can you provide OEM/ODM service?
A5:Yes. Please feel free to contact us for more detailed discussions.
 
Q6:What product information do I need to provide?
A6:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.
 
Q7:Supported trade methods
A7: FOB,CIF,CFR Shipping ports: Qingdao Port, Tianjin Port