Products
Hot- rolled auto steel
|
variety
|
Steel grade
|
standard/specification
|
Purposes & LYS product characteristics
|
|
Auto beam steel
|
LG590L、590L
LG610L、510L
LG700L
|
GB/T3273
GB/T3273
|
They are mainly used in manufacturing automobile longitudinal beam, cross beam and so on. They have good stamping property and high strength which adapt to the automobile development requirement of high strength and lower weight.
|
|
Auto steel
|
S355MC
S420MC
S460MC
S500MC
S550MC
S600MC
S700MC
|
EN10149.1
EN10149.2
EN10149.1
EN10149.2
Technique specification
|
They are mainly used in automobile structure, wheel and so on, especially suitable for internal structure such as ground connecting pieces, vehicle parts chassis, stiffener support, cross beam, longitudinal beam and so on. They have strong strength, good synthetic mechanical properties, good weldability and dimension of high accuracy.
|
|
DP540
DP600
DP690
|
Technique specification
|
They are mainly used in auto beam, wheel rim steel, spokes, complex structural parts, seat guide rail, shock absorbing hood, fastening piece and so on. They have high strength and good formability to cater for complex deformation.
|
|
|
SAPH310
SAPH370
SAPH400
SAPH440
|
JISG3113
JISG3113
Technique specification
|
They are mainly used in vehicle wheel, cross beam, structural parts and so on. They have good combination property, good surface quality and profile, dimension of high accuracy, good forming and stamping property.
|
key performance indicator
|
Variety
|
grades
|
mechanical property
|
|||
|
（MPa）yield strength
|
（MPa）tensile strength
|
elongation
|
180°bending(b=35mm)
|
||
|
Auto beam
|
LG510L
|
≥355
|
520-630
|
≥24
|
d=0.5a
|
|
LG590L
|
≥460
|
590-720
|
≥20
|
d=a
|
|
|
LG610L
|
≥500
|
610-720
|
≥18
|
d=a
|
|
|
LG700L
|
≥630
|
700-810
|
≥15
|
d=2a
|
|
|
Wheel steel
|
SAPH370
|
≥225
|
≥370
|
≥37
|
d=a
|
|
SAPH400
|
≥255
|
≥400
|
≥37
|
d=2a
|
|
|
SAPH440
|
≥305
|
≥440
|
≥35
|
d=2a
|
|
|
380CL
|
≥235
|
380-480
|
≥28
|
d=a
|
|
|
Structural steel
|
ST37-2
|
≥235
|
340-510
|
≥24
|
d=0.5a
|
|
SM490A
|
≥325
|
490-610
|
≥22
|
d=a
|
|
|
STKT590
|
≥440
|
590-740
|
≥20
|
d=a
|
|
|
ST37-2G
|
≥310
|
400-600
|
≥22
|
d=a
|
|
|
S700MC
|
≥700
|
750-950
|
≥12
|
d=2a
|
|
Technique guarantee for key process
1.Top and bottom combined blowing process is adopted in steelmaking. Microcomputer control and automatic N/Ar change-over are used in bottom air-supply. Sub-lance dynamic control is used in steelmaking to improve hitting rate at the final.
2.Adopt slag carry over detecting technique to improve purity of liquid steel.
3.Refining with ladle furnace to ensure narrow composition control and low phosphorous and sulfur content and inclusion content.
4.Cast without oxidation protection for the whole progress to reduce inclusion. Use soft reduction segment control technique to reduce segregation and center porosity and modify organization.
5.Automatic width control (AWC) and roll gap control (electric APC + hydraulic APC) are adopted on rough rolling mill to ensure the control accuracy of width and thickness.
6.Rough rolling mill adopts advanced profile and thickness control system and finishing temperature control to ensure the size accuracy, profile and finishing temperature of strip.
7.The cooling system after rolling adopts the combination of ultra-fast cooling and conventional laminar cooling, and 18 cooling sections. Its temperature control range (200~650℃) is big so that the coiling temperature can be controlled accurately and the stability of properties can be ensured.
8.We have already passed TS16949 quality system certification.
