In the manufacturing of consumer electronics, precision instruments, and various micro-switches, internal contact springs serve as core conductive and elastic elements, demanding exceptionally rigorous standards regarding material hardness, strength, and gauge precision. Recently, we received a highly representative, high-standard inquiry: 301 stainless steel, with a thickness of 0.2mm, a width of 200mm, in the FH (Full Hard) temper, requiring a hardness of HV 430–490, specifically for manufacturing electronic product springs, with a required quantity of 2 tons.
Facing orders of this caliber that combine high strength with micron-level precision requirements, how do we achieve flawless quality delivery? We have delivered a hardcore solution through advanced front-end rolling and stringent quality control.
I. International Standard Guarantee: Stable Supply Compliant with ASTM A666
To address the electronics industry's strict demands for material stability and global compliance, we consistently provide stable supplies of 301 stainless steel in the FH temper in accordance with the ASTM A666 standard. Through substantial cold working deformation, 301 stainless steel (an austenitic grade) undergoes significant work hardening, granting it exceptional strength and elasticity—making it an ideal choice for manufacturing high-wear-resistance and high-fatigue-life springs.
II. Empowered by the 20-High Sendzimir Mill: Precisely Controlling the HV 430–490 Hardness Window
Efficiently and accurately cold-rolling stainless steel strips down to an ultra-thin thickness of 0.2mm while locking the hardness strictly within the HV 430–490 range presents a massive challenge for conventional rolling mills.
Hardcore Control: We rely on our advanced 20-high Sendzimir mill for multi-pass precision cold rolling. This equipment provides exceptional rigidity and uniform reduction force, ensuring that the final hardness of the material is stably locked between HV 430 and HV 490.
Superior Mechanical Properties: Alongside high hardness, the material's comprehensive mechanical indicators are equally outstanding—featuring a tensile strength ≥1320MPa, yield strength ≥1030MPa, and an elongation rate maintained at ≥5%, guaranteeing high resilience while retaining essential anti-fracture toughness.
III. Winning in Micron-Level Details: Exceptional Flatness and Stamping Consistency
For precision strips measuring only 0.2mm in thickness and 200mm in width, even the slightest deviation in flatness can trigger massive rejection rates during the client's subsequent continuous stamping processes.
Flatness Control: Utilizing high-precision gauge and shape control systems, we strictly limit strip flatness to ≤3 I-unit, thoroughly eliminating hidden defects such as edge waves, center buckles, or warping common in coil stock.
Stamping Yield Assurance: The extreme flatness and uniform hardness distribution ensure that during high-speed precision stamping, the rebound height and geometric dimensions of every single electronic spring achieve perfect consistency, substantially boosting production efficiency and final product yields for our clients.
IV. End-to-End Quality Assurance for Worry-Free Delivery
To ensure our clients buy with confidence and use with peace of mind, every 2-ton batch of 301 stainless steel FH temper strips we deliver is accompanied by a detailed Material Test Report (MTR) verifying its mechanical properties with empirical data.
Through the powerful combination of "20-high precision rolling equipment + ASTM A666 international standards + rigorous shape control," we continue to deliver stable, reliable, high-hardness precision special steel solutions to the global electronics manufacturing industry.
Baoshan District,
Shanghai, China.
