1. Can cold-rolled coils really be used to produce precision stamped parts?
Absolutely. Precision stamping is a precision blanking process developed from ordinary stamping. It belongs to non-cutting machining technology, and steel is the most widely used fine stamping material. Cold-rolled coils, due to their high surface quality and excellent dimensional accuracy, have become the basic raw material in the field of precision stamping. Fine stamping steel is usually made from hot-rolled special steel billets, which undergo precision cold rolling and heat treatment processes to achieve specific thickness, precision, surface quality, and performance parameter requirements, ultimately becoming a special steel material used for the fine stamping of parts.
Taking SPCC cold-rolled steel coils as an example, as a general-purpose cold-rolled carbon steel sheet, it features high surface flatness, excellent stamping performance, and excellent dimensional accuracy, and is widely used in home appliances, automotive parts, precision instruments, and other fields. Furthermore, companies such as Panzhihua Iron and Steel Group have successfully developed 50Mn and 65Mn cold-rolled fine stamping steels, with good surface quality and mechanical properties meeting user requirements. Shanxi Jianlong's independently developed stamping-grade cold-rolled steel sheet DC03 has been tested by automotive parts processing companies and found to produce stamped parts with good forming quality, high precision, beautiful surface, and no cracking, fully meeting the stringent requirements of the automotive parts industry for stamping steel. It can be said that cold-rolled coils can not only be used to make precision stamped parts, but have also been successfully applied in this field.
2. What grades of cold-rolled steel are mainly used in precision stamping? What are their characteristics?
The cold-rolled steel grade system commonly used in precision stamping is relatively mature, and selection can be made based on the stamping difficulty and the complexity of the parts. Taking the JIS standard as an example:
SPCC: Ordinary grade cold-rolled carbon steel, used for general stamping and bending applications. It has moderate formability and a tensile strength of 270-410 MPa, suitable for shallow drawing and bending parts.
SPCD: Stamping grade cold-rolled carbon steel, with better formability than SPCC, suitable for medium-complexity drawn parts such as chassis and headliners.
SPCE/SPCF: Deep-drawing grade cold-rolled carbon steel, with excellent formability, suitable for deep-drawing parts such as mudguards and rear side panels.
SPCG: Ultra-deep-drawing grade, extremely low-carbon cold-rolled steel, with excellent deep-drawing machinability, suitable for complex curved surface parts such as automotive interior panels.
3. What are the unique advantages of cold-rolled coils for precision stamping?
Cold-rolled coils have become the mainstream material for precision stamping primarily due to the following six advantages:
First, superior surface quality. Cold-rolled steel has a smooth surface, free of oxide scale, and a surface roughness Ra of less than 0.8μm, allowing direct use in high-precision stamping without pretreatment. Second, high dimensional accuracy. The thickness tolerance of cold-rolled coils can be controlled within ±0.01-0.03mm, meeting the stringent requirements for thickness uniformity in precision stamping. Third, excellent formability. Stamping-grade cold-rolled sheets possess excellent plasticity and toughness, without yield plateaus or tearing during stamping. They have a wide stamping plasticity range and good shape stability, suitable for various stamping processes such as bending, stretching, and flanging, enabling the production of complex-shaped parts with high precision requirements. For example, Shanxi Jianlong's stamping-grade cold-rolled sheets have an elongation ≥40.0%, n-value ≥0.2, and r-value ≥2.0, fully meeting the processing requirements of complex stamping parts. Fourth, high stamping efficiency. Large stamped parts can be produced in multiples per minute, while small parts, through high-speed stamping, can reach thousands per minute, making them suitable for mass production. Fifth, material utilization is high. Cold stamping typically achieves a material utilization rate of 70%–85%, enabling production with little or no waste. Sixth, finished products exhibit excellent performance. Stamped parts are lightweight, high-strength, and rigid, balancing structural lightweighting with reliable operation.
4. Material Selection for Different Precision Stamped Parts?
The selection of materials for precision stamped parts requires comprehensive consideration of three dimensions: stamping process characteristics, product functional requirements, and cost control.
Based on Stamping Process Type: Shallow-drawn or bent parts (such as electronic connectors and small hardware brackets) can use ordinary-grade cold-rolled steel sheets such as SPCC; deep-drawn parts (such as battery casings and automotive fuel tank liners) require deep-drawing grade materials such as DC04, DC06, and SPCE, demanding high plasticity, low yield strength, and uniform grain structure to avoid tensile cracking; precision stamped parts (such as gear plates and sensor springs) require materials with uniform hardness and small thickness tolerances to ensure a smooth, burr-free stamped surface.
Based on Product Operating Conditions: Load-bearing structural parts require high tensile strength and high yield strength, and can be selected from high-strength steel series; high-precision elastic parts (such as spring sheets and clips) can be selected from spring steel materials such as 65Mn and SK5.
Based on cost and batch size: For mass-produced civilian products, high-performance materials such as SPCC cold-rolled steel plates with good cost performance are preferred; for high-end precision products, high-performance materials such as stainless steel, copper alloy, and aluminum alloy are selected.
5. What are the industry prospects for cold-rolled precision stamping parts?
The cold-rolled precision stamping parts industry has broad development prospects. In terms of market size, the domestic cold-rolled strip steel market exceeded 18 million tons in 2025, with the demand for deep-drawing steel in automotive parts and home appliance casings growing at an annual rate of 12%. As the core material for cold-rolled precision stamping, as of 2024, my country's precision stamping steel industry produced 1.202 million tons, with a demand of 1.14 million tons, and the market size grew from 5.996 billion yuan in 2018 to 7.25 billion yuan in 2024.
In terms of application expansion, precision stamping materials have expanded from traditional automotive parts and electrical products to multiple industries such as instrumentation, rail transportation, aerospace, construction machinery, chemicals, and cutting tools. The Chinese market for precision stamping special steel has broad prospects, with current demand at approximately 1 million tons per year. With the development of the automotive manufacturing industry and the increasing use of precision stamping materials per vehicle compared to developed countries, the market still has significant growth potential.
From an industry trend perspective, with the popularization of intelligent manufacturing, the application of precision stamping steel in consumer electronics, automotive lightweighting, and medical devices is constantly expanding, with wear resistance, precision stamping performance, and ultra-thin properties becoming key research and development focuses. Meanwhile, under the "dual carbon" (carbonization and energy conservation) framework, precision stamping materials offer advantages such as material savings, reduced energy consumption, and reduced waste, and their application areas are expected to further expand. For cold-rolled steel suppliers, mastering the research and development and production capabilities of stamping-grade cold-rolled sheets will be crucial to seizing market share in the precision manufacturing sector.