1. High quality base plate is adopted, and the requirements for the surface, shape and dimensional accuracy of the base plate are getting higher and higher. For outdoor use, such as small zinc flake flat hot-dip galvanized steel coils, non zinc flake flat hot-dip galvanized steel coils, and zinc alloy hot-dip galvanized steel coils emerging in time; For indoor use, such as galvanized steel coils, film coated cold-rolled sheets and aluminum coils.
2. Improve the pre-treatment process and pre-treatment solution. The number of equipment is small and the cost is low, becoming the mainstream process. Constantly improve the stability, corrosion resistance and environmental protection performance of the pre-treatment solution.
3. Remake the development of coatings, and improve the general polyester, polyvinylidene fluoride (PVDF) and plastic sol to obtain super color reproducibility, UV resistance, sulfur dioxide resistance and corrosion resistance; Development of pollution resistant, heat absorbing and other functional coatings.
4. The unit equipment is more complete. For example, new welding machines, new roller coating machines, improved curing furnaces, and advanced automatic instruments are used.
5. Cold embossing production technology has become a development trend because of its lower cost than hot embossing, beautiful appearance, stereoscopic feeling and high strength.
6. Focus on product diversification, functionality and high-end, such as deep drawing color coated plate, "grapefruit peel" color coated plate, anti-static color coated plate, pollution resistant color coated plate, high heat absorption color coated plate, etc

1、 Brief introduction of 35 # steel plate: 35 # steel plate has good plasticity and appropriate strength, good process performance and acceptable welding performance, and is mostly used in the normalized and quenched and tempered state.
2、 Use of 35 # steel:
35 # steel is widely used in manufacturing various forgings and hot-pressed parts, cold-drawn and upset forged steel, seamless steel pipes, and parts in mechanical manufacturing, such as crankshaft, shaft, pivot pin, lever, connecting rod, beam, sleeve, rim, washer, screw, nut, etc.
3、 Chemical composition of 35 # steel:
Carbon C: 0.32 ～ 0.40
Silicon Si: 0.17 ～ 0.37
Manganese Mn: 0.50-0.80
Sulfur S: ≤ 0.035
Phosphorus P: ≤ 0.035
Chromium Cr: ≤ 0.25
Nickel Ni: ≤ 0.25
Copper Cu: ≤ 0.25
4、 Mechanical properties of 35 # steel:
Tensile strength σ b (MPa)：≥530(54)
yield strength σ s (MPa)：≥315(32)
Elongation δ 5 (%)：≥20
Reduction of area ψ (%)：≥45
Impact energy Akv (J): ≥ 55
Impact toughness value α kv
(J/cm ²)：≥ 69(7)
Hardness: not heat treated ≤ 197HB
Sample size: 25mm
National standard for technical performance: GB699-1999
5、 Difference between 35 # steel and 45 # steel
45 # steel is a high-quality carbon structural steel, its strength is 61, HRC is 48-55, and it is widely used in machinery; No. 35 is also a high-quality carbon structural steel, but its strength is only 54 and HRC is 38-45.

1. Cold drawn or cold rolled precision seamless steel tubes (GB3639-83) are cold drawn or cold rolled precision seamless steel tubes with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Selecting precision seamless steel pipe to manufacture mechanical structure or hydraulic equipment can greatly save machining hours, improve material utilization and improve product quality.
2. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling, which can be divided into drill pipes, drill collars, core pipes, casings and settling pipes according to their uses.
3. Marine carbon steel seamless steel pipe (GB5213-85) is a carbon steel seamless steel pipe used for manufacturing Class I pressure pipe system, Class II pressure pipe system, boiler and superheater. The working temperature of carbon steel seamless steel pipe wall shall not exceed 450 ℃, and that of alloy steel seamless steel pipe wall shall exceed 450 ℃.
4. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are hot-rolled and cold drawn (rolled) seamless steel tubes made of high-quality carbon structural steel used to manufacture superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers.
5. High pressure fuel pipe for diesel engine (GB3093-86) is a cold drawn seamless steel pipe used to manufacture high pressure fuel pipe for diesel engine injection system.
6. The oil drilling pipe (YB528-65) is a seamless steel pipe used for internal thickening or external thickening at both ends of oil drilling. The steel pipe is divided into two types: turning thread and non turning thread. The turning thread pipe is connected with a joint, and the non turning thread pipe is connected with a tool joint by butt welding.