{"id":2168,"date":"2026-07-01T22:08:40","date_gmt":"2026-07-01T14:08:40","guid":{"rendered":"https:\/\/metalstampingparts.ltd\/?page_id=2168"},"modified":"2026-07-01T22:08:40","modified_gmt":"2026-07-01T14:08:40","slug":"post-stamping-heat-treatment-hardness-control","status":"publish","type":"page","link":"https:\/\/metalstampingparts.ltd\/fil\/post-stamping-heat-treatment-hardness-control\/","title":{"rendered":"Post-Stamping Heat Treatment and Hardness Control"},"content":{"rendered":"

Short answer:<\/strong> Post-stamping heat treatment should be specified when a stamped part needs controlled hardness, spring force, stress relief, wear resistance, or dimensional stability after forming. The RFQ should define material grade, starting temper, target hardness or spring property, heat treatment route, distortion limits, inspection method, and lot traceability.<\/p>\n

Some stamped parts are complete after forming and deburring. Others need heat treatment or stress relief to reach the required spring behavior, hardness, or stability. Spring clips, retaining parts, stainless spring features, beryllium copper contacts, and formed spring steel parts can all change after heating if the process is not controlled.<\/p>\n

Heat treatment should not be treated as an afterthought. It can affect flatness, springback, plating, oxide color, burr condition, and dimensional inspection. Use this page with the stainless steel spring clip guide<\/a>, the beryllium copper spring contact guide<\/a>, and the metal stamping springback guide<\/a>.<\/p>\n

When heat treatment matters<\/h2>\n\n\n\n\n\n\n\n\n\n
Part need<\/th>\nWhy heat treatment may be used<\/th>\nRFQ detail to provide<\/th>\n<\/tr>\n<\/thead>\n
Spring force<\/td>\nFormed spring features may need stress relief or age hardening.<\/td>\nRequired force, deflection, material grade, and functional test method.<\/td>\n<\/tr>\n
Hardness<\/td>\nWear surfaces, clips, or locking features may need a hardness range.<\/td>\nTarget hardness scale, test location, and acceptable range.<\/td>\n<\/tr>\n
Dimensional stability<\/td>\nHeat can reduce residual stress but may also distort thin parts.<\/td>\nFlatness, coplanarity, hole position, or functional fit requirements.<\/td>\n<\/tr>\n
Conductive spring contact<\/td>\nCopper alloys may need aging to balance conductivity and spring properties.<\/td>\nBase alloy, temper, conductivity need, contact force, and plating sequence.<\/td>\n<\/tr>\n
Downstream finish<\/td>\nHeating can affect oxide color, cleaning, passivation, or plating adhesion.<\/td>\nFinish sequence, cosmetic zones, cleaning need, and corrosion requirement.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Start with material and temper<\/h2>\n

The same heat treatment requirement can mean different things depending on the starting material. Spring steel, stainless spring material, phosphor bronze, and beryllium copper respond differently. A drawing that states only “heat treat” is not enough. The supplier needs material grade, thickness, starting temper, target property, and whether the stamped geometry can tolerate distortion.<\/p>\n

For copper alloy contacts, review the phosphor bronze and beryllium copper contact guide<\/a>. For terminals and contacts, connect heat treatment with terminal contact design<\/a> because spring force, conductivity, plating, and forming sequence are linked.<\/p>\n

Control distortion after heating<\/h2>\n

Heat can relax forming stress, but it can also move thin sections, spring arms, tabs, or flat areas. If the part has tight flatness, coplanarity, or contact height, the inspection plan should include those features after heat treatment, not only after stamping.<\/p>\n

Use the flatness and warpage guide<\/a> and the coplanarity guide<\/a> when the part must remain stable after heating. If a dimension is critical to assembly, include it in the critical dimensions inspection plan<\/a>.<\/p>\n

Heat treatment and finishing sequence<\/h2>\n

The sequence matters. Some parts are heat treated before plating. Some are plated after stress relief. Some stainless parts may need cleaning or passivation after heating. If cosmetic appearance matters, oxide color and stain limits should be defined. If soldering or contact resistance matters, surface condition after heat treatment must be considered.<\/p>\n

For plated or passivated parts, connect the heat treatment plan with the plating and passivation RFQ guide<\/a>. For surface appearance, also use the surface finish inspection guide<\/a>.<\/p>\n

RFQ checklist for heat-treated stamped parts<\/h2>\n