Cold rolled

Cold rolling: hot rolled coil as raw materials for cold rolling after pickling descaling, the finished product is rolling hard volumes, due to continuous cold work hardening caused by deformation of the strength of the rolling hard volumes, and increased hardness, toughness plastic index decreases. Accordingly stamping performance will deteriorate and can only be used for simple modification parts. Rolling hard volumes can be used as raw material for hot-dip galvanizing plant, because hot dip galvanizing line is provided with annealing line. Rolling hard volumes generally weighs 6 to 13.5 tons of steel coils at room temperature, the volume of hot pickling continuous rolling. An inner diameter of 610mm.

HC350/600CP

BLC

DC52D+ZF

BCB-1

HC500/780CP

BLC-JD1

DC53D+ZF

BUDAK-2

HC780/980CP

BLC-JD2

DC54D+ZF

BCB-2

HD680/780CP

BLC-JD3

DC56D+ZF

DC04

HC700/980CP

BLD

DC57D+ZF

DC03

HC350/600CPD+Z

BLD-JD1

DD51D+Z

DC01

HC500/780CPD+Z

BLD-JD2

DD54D+Z

ASTM A1008 CS TYPE C

HC700/980CPD+Z

DC51D+AZ

S220GD+Z

ASTM A1008 CS TYPE B

HC780/980CPD+Z

DC52D+AZ

S250GD+Z

ASTM A1008 CS TYPE A

HD620/750CPD+Z

DC53D+AZ

S280GD+Z

SAEJ 403 1008

HD680/780CPD+Z

DC54D+AZ

S320GD+Z

SAEJ 403 1006

HD720/950CPD+Z

S250GD+AZ

S350GD+Z

SPCEN

HC450/950TW

S300GD+AZ

S550GD+Z

SPCE

1200

S550GD+AZ

S220GD+ZF

SPCD

B1200HS

S350GD+AZ

S250GD+ZF

SPCC

BR1200HS

DC01

S280GD+ZF

SAEJ 403 1010

HC950/1300HS

DC03

S320GD+ZF

BHG1

HD950/1300HS

DC04

S350GD+ZF

BHG2

HC380/590TR

DC05

HC180YD+Z

BHS11

HC400/690TR

DC06

220YD+Z

BHS3

HC420/780TR

DC07

HC260YD+Z

BZJ495 2008 BDCK

HC380/590TRD+Z

SPCC appliance steel

HC180YD+ZF

SECD

HC400/690TRD+Z

SPCD appliance steel

HC220YD+ZF

SECE

HC420/780TRD+Z

SPCE appliance steel

HC260YD+ZF

SECC

HC700/980MS

SPCF appliance steel

B240P1D+ZF

St37-2G

HC950/1180MS

SPCG appliance steel

B260LYD+ZF

St37-3G

HC1030/1300MS

BLD appliance steel

HC180BD+Z

St52-3G

HC1150/1400MS

BUSD appliance steel

HC220BD+Z

B340/590DP

HC1200/1500MS

BUFD appliance steel

HC260BD+Z

B400/780DP

HC1350/1700MS

BSUFD appliance steel

HC300BD+Z

B140H1E+Z

HC250/450DP

BLC appliance steel

HC180BD+ZF

B170P1E+Z

HC280/590DP

BLC-JD1

HC220BD+ZF

B180H2E+Z

HC290/490DP

BLC-JD2

HC260BD+ZF

B180H1E+Z

HC420/780DP

BLC-JD3

HC300BD+ZF

B180P2E+Z

HC500/780DP

BLD-JD1

HC260LAD+Z

B210P1E+Z

HC550/980DP

BLD-JD2

HC300LAD+Z

B220P2E+Z

HC700/980DP

BLD-JD3

HC340LAD+Z

B250P1E+Z

HC820/1180DP

SECC

HC380LAD+Z

B340/590DPE+Z

HC340/590DP

SECD

HC420LAD+Z

B340LAE+Z

HC250/450DPD+Z

SECE

HC260LAD+ZF

B400/780DPE+Z

HC280/590DPD+Z

SECF

HC300LAD+ZF

B410LAE+Z

HC300/500DPD+Z

BUSDE+Z

HC340LAD+ZF

BLCE+Z

HC340/590DPD+Z

BUFDE+Z

HC380LAD+ZF

BLDE+Z

HC420/780DPD+Z

BLDE+Z

HC420LAD+ZF

BSUFDE+Z

HC500/780DPD+Z

BLCE+Z

HD340LAD+Z

BUFDE+Z

HC550/980DPD+Z

BSUFDE+Z

HD410LAD+Z

BUSDE+Z

HC650/980DPD+Z

DC01E+Z

HC300/500DPD+Z

SECIF

HC820/1180DPD+Z

DC03E+Z

HC250/450DPD+Z

SECD

HC250/450DPD+ZF

DC04E+Z

HC280/590DPD+Z

SECE

HC280/590DPD+ZF

DC05E+Z

HC340/590DPD+Z

SECC

HC300/500DPD+ZF

DC06E+Z

B340/590DPD+Z

B180H2

HC340/590DPD+ZF

DC07E+Z

HC420/780DPD+Z

B180H1

HC420/780DPD+ZF

DC51D+Z

HC550/980DPD+Z

B140H1

HC550/980DPD+ZF

DC52D+Z

HC250/450DPD+ZF

B410LA

HC650/980DPD+ZF

DC53D+Z

HC300/500DPD+ZF

B340LA

HC820/1180DPD+ZF

DC54D+Z

HC280/590DPD+ZF

B170P1

HC500/780DPD+ZF

DC56+Z

HC340/590DPD+ZF

B180P2

HC550/980DP-ELD+Z

DC57D+Z

B340/590DPD+ZF

B210P1

HC550/980DP-ELD+ZF

DC51D+ZF

HC420/780DPD+ZF

B220P2

DC03

HC700/980CPD+Z

HC380/590TRD+Z

B250P1

DC04

HC500/780CPD+Z

HC400/690TRD+Z

BLC

DC05

HD620/750CPD+Z

HC420/780TRD+Z

BLD

DC06

HD680/780CPD+Z

HC420/780TRD+ZF

BSUFD

SPCC

HD720/950CPD+Z

HC400/690TRD+ZF

BUFD

SPCD

HC350/600CPD+ZF

HC380/590TRD+ZF

BUSD

SPCE

HC700/980CPD+ZF

HC350/600CPD+Z

DC01

SPCEN

HC500/780CPD+ZF

H220PD+Z

H180YD+ZF

DC51D + Z

HC700/980CPD+ZF

H260PD+Z

H220YD+ZF

DC53D+Z

HD680/780CPD+ZF

H220PD+ZF

H260YD+ZF

DC52D+Z

HD720/950CPD+ZF

H300LAD+Z

H180BD+Z

DC54D+Z

HC620/750CPD+ZF

H340LAD+Z

H180BD+ZF

DC56D+Z

S250GD+Z

H420LAD+Z

H220BD+Z

DC51D+ZF

S280GD+Z

H380LAD+Z

H260BD+Z

DC52D+ZF

S550GD+Z

H300LAD+ZF

H220BD-ZF

DC53D+ZF

SS320GD+Z

H340LAD+ZF

H260BD+ZF

DC54D+ZF

S250GD+ZF

H220YD+Z

DC52D+Z

DC56D+ZF

S280GD+F

H180YD+Z

DC51D+Z

S220GD+Z

S320GD+ZF

H260YD+Z

 

S350GD+Z

S550GD+ZF

S220GD+ZF

 

Cold rolling at room temperature, is machined from hot-rolled plates made, although the process also makes steel rolling because warming was nevertheless called cold rolling. By the continuous hot rolling after cold deformation from the cold rolling, relatively poor mechanical properties, hardness is too high, it must be annealed to restore its mechanical properties without annealing called rolling hard volumes. Rolling hard volumes generally used to do without bending, stretching products, rolling hard thickness of 1.0 or less lucky on both sides or four sides bent.

Chemical composition :

Grade

C

Si

Mn

P

S

Cu

SPCC

0.02~0.08

≤0.10

0.15~0.30

≤0.045

≤0.050

≤0.050

Q195

0.06~0.12

≤0.30

0.25~0.50

≤0.045

≤0.050

≤0.050

Q235-B

0.12~0.20

≤0.30

0.30~0.70

≤0.045

≤0.050

≤0.050

Cold rolling production process

Cold-rolling and commonly used way. Cold rolling production process generally include raw material preparation, pickling, rolling, degreasing, annealing (heat treatment), finishing and so on. Cold to hot-rolled products as raw materials, cold raw material before first removal, to ensure that the surface of the cold rolled products clean. Rolling the material deformation is the main step. The purpose is to be attached to skim grease rolled on the rolling is removed, to prevent pollution of the steel surface during annealing, but also to prevent the stainless steel by carbon. Annealing including intermediate annealing and final heat treatment, the intermediate annealing is through recrystallization work hardening produced eliminate cold deformation, to recover plastic material and reduce the deformation resistance of the metal. Finished purpose of heat treatment except through recrystallization eliminate hardening outside. In that according to the technical requirements for products to obtain tissue (such as a variety of texture, etc.) and the desired product properties (such as deep drawing, electromagnetic properties, etc.). Finishing includes inspection, shear, straightening (flat), printing, packaging and other content classification. Cold-rolled products have a high packing requirements, to prevent product during transport surface is scratched. The step when external production of some special products in addition to each have their own special process. As time rolled silicon steel sheet before cold rolling to decarburization annealing, after rolling to conduct film, high-temperature annealing, stretching straightening (see tension straightening) and tempering.

Cold-rolled grades available

B23G110

B23R080

B50A1000

DC54

B23G120

B23R085

B50A1300

S280

B27G110

B23R090

B65A470

S300

B27G120

B27R085

B65A600

S350

B27G130

B27R090

B65A700

S550

B30G120

B27R095

B65A800

DR – 7M

B30G130

B35A210

B65A1000

DR – 8

B30G140

B35A230

B65A1300

DR – 8M

B35G135

B35A250

B35AH230

DR – 9

B35G145

B35A270

B35AH250

DR – 9M

B35G155

B35A300

B35AH300

DR – 10

B23P085

B35A360

B50AH300

 

B23P090

B35A440

B50AH350

 

B23P095

B35A550

B50AH470

 

B23P100

B50A230

B50AH600

 

B27P090

B50A250

B50AH800

 

B27P095

B50A270

B50AH1000

 

B27P100

B50A290

B35AR300

 

B30P100

B50A310

B50AR300

 

B30P105

B50A350

B50AR350

 

B30P110

B50A400

B20AT1200

 

B30P120

B50A470

B20AT1500

 

B35P115

B50A540

DC51

 

B35P125

B50A700

DC52

 

B35P135

B50A800

DC53

 

Rolling mill for cold-rolled strip has a two-roll mill, four-high mill and the cluster mill. The most widely used four-roll mill. Rolled thinner product will have to adopt a multi-roll mill. Many types of multi-roll mill, such as the six-high rolling mill, roller mill partial eight, twelve roll mill, twenty roll mill, etc. (see mill). With the improvement of the flatness requirements, we developed many improved flatness of techniques, such as bending technology, technology and cross roll technology channeling rolls. Cold rolling strip mill per rack arrangement can be divided into single reversible or irreversible type and continuous multi-machine categories. The former applies to more variety, small batch or alloy steel products case large scale. Its low investment, quick construction, but low yield, large consumption of metal. Multi-stand continuous rolling product varieties more suitable for single or little change in the situation, it has a high production efficiency, yield advantages, but a larger investment. And hot rolled strip (see hot rolling wide strip steel production technology, production of hot rolled narrow strip) compared to cold rolled strip (see cold-rolled strip production) of the rolling process has the following characteristics: (1) using the process of lubrication and cooling to reduce deformation resistance and the cooling roll during rolling; (2) using a large tension rolling, to reduce deformation resistance and stable rolling process. The average unit value of the materials used tension yielding 10% to 60% strength, generally not more than 50%; (3) multi-rolling process rolling. Because of cold rolled to produce material hardening, when the total amount of deformation of 60% to 80%, it becomes difficult to continue deformation. To do this intermediate annealing, after the rolled material is softened to proceed. In order to get thin strip requirements, intermediate annealing so it may take several. Rolling between the two intermediate annealing is called a rolling process. Annealed cold-rolled strip steel in a protective gas continuous annealing furnace or annealing furnace is performed (see cold-rolled strip annealing). The minimum thickness of cold-rolled strip current can reach 0.05mm, cold-rolled foil can reach 0.001mm.

Mechanical Properties

Grade

Yield Strength RcL
Mpa

tensile strength Rm
Mpa

Elongation A80mm
%

Impact test (longitudinal)

temperature℃

Impact energy AkvJ

SPCC

≥195

315~430

≥33

 

 

Q195

≥195

315~430

≥33

 

 

Q235-B

≥235

375~500

≥25

20

≥27