1. Material introduction:
NM-400 (A) is an ultra-high strength and high toughness steel plate. It has high strength and anti-wear properties; good weldability and corrosion resistance; excellent cold bending performance and good processability. It is widely used in the manufacturing of various mechanical equipment and the production of metal structural parts.
2. Production process
1. Raw material preparation → Uncoiling → Straightening → Orthopedizing → Trimming → Punching → Blanking → Annealing → Pickling and passivation → Oiling → Baking Dry → Inspect and put into storage
2. Production process
(1) Cut into steel strips or sheets of required specifications and then flatten them. Cut into plates of different thicknesses according to customer requirements. (Generally, an automatic slitting machine is used).
(2) Treat the surface of the raw material before rolling the whole sheet. Generally, sand blasting is used to remove the scale, and then it is cleaned with solvent and then baked and dried at high temperature.
(3) Put the steel into the heating furnace and heat it to about 850~950°C and keep it warm for a certain period of time to eliminate residual stress (to prevent deformation), and then slowly enter the finishing rolling unit with the hot roller to continue rolling.
(4) After rough rolling, the billet is sent to the fine rolling process to further remove oxides, and then is repeatedly rolled through multiple passes to make the original loose and segregated part of the structure dense to improve the mechanical properties. , controlled by the finished product output device to achieve the required dimensional accuracy and quality level.
(5) In order to avoid excessive internal cracks, the cooling rate should be reduced as much as possible and the linear energy utilization coefficient should be increased under the premise of quality to reduce heat loss.
(6) When the product needs to be packaged, use special shearing equipment to cut it to avoid artificial damage.
3. Technical points
1. Material selection
Nm-400 belongs to alloy tool steel and is mainly used to make cutting tools, molds and other parts. Different uses have certain requirements and requirements for the hardness of the material. Currently, commonly used brands on the market include 4Cr5Mo, 4CR9Si2V1WMn, 3Cr3MO, 2 Cr7Ni2Al, 5CrNiMo, 6crwmo, 9Cr18, 7 Cr17, 1Cr12 Mo V, 0Cr13 W6 O8 NiTiB and other brands.
We also provide forging blanks and CNC precision machining services for our clients, covering industries such as energy, petrochemicals, steel, engineering machinery, plastics, prevention and control, hydraulics, healthcare, and food. Please feel free to send us drawings for inquiries.
Metalworking Services
CNC Machining
Sheet Metal Fabrication
Metal Welding
Metal Cutting
Metal Bending
Metal Punching
Metal Forging
Metal Sheet Rolling
Tube and Plate Drilling
Our heavy-duty forging presses support open-die forging and deformation of large-section forgings, including discs, shafts, blocks, and custom components. This capability enables us to meet the demanding forming requirements of heavy industrial applications.
Heat treatment is a critical step in achieving the mechanical properties required for heavy-duty forgings. Our process capabilities meet the strength, toughness, and structural stability requirements for forged components used under demanding operating conditions.
We offer machining capabilities for large forged shafts and long cylindrical components, supporting both rough and finish machining. This capacity is suitable for stepped shafts, rotor shafts, rollers, and other heavy-duty forged shaft components.
Our machining facilities are capable of handling large ring-shaped forgings and circular parts that require precise turning, face machining, boring, and contour control. This capability is suitable for industrial ring blanks, heavy-duty circular parts, and machined ring forgings.
We offer machining solutions for heavy-duty cylindrical, hollow, and tubular forgings. This capability supports the machining of sleeves, cylinders, and other thick-walled forged components used in pressure vessels, rotating systems, and general industrial applications.
Quality control is integrated into our production process through the inspection and testing of forged and machined parts. Our capabilities help verify the dimensional accuracy, condition, and quality consistency of industrial forgings prior to delivery.
Finished forgings are properly protected and packaged to minimize the risk of damage during storage and transportation. Our packaging methods ensure the safe domestic delivery and export shipment of machined and high-value forged components.
