High Clean Level/SAE-J444 steel grit gl25 for Girder Coating

Steel Grit is made by crushing steel shot to angular particle subsequently tempered to different hardness to cater for different application, screened by size according to SAE Standard specification. 3.Steel Grit Specification Product Name Chemical Composition Chemical Composition C 0.70-1.20% Cr 0.26% Mn 0.6-1.20% Si 0.40-1.20% S ≤0.05% P ≤0.05% Micro Hardness GP:42-50HRC (399509HV) GL:56-60HRC (620713HV) GH:63-66HRC (795889HV) Hardness Deviation Max Deviation ±3.0HRC,±40HV Type G10 G12 G14 G16 G18 G25 G40 G50 G80 G120 Diameter 2.5mm2.0mm1.7mm1.4mm1.2mm1.0mm 0.7mm0.4mm0.3mm0.2mm Microstructure Even tempered martensite and dispersed carbon Quality Standard SAE, ISO9001 Durability ≥3000 times Shape Angular 4.Steel Grit Production Technology Smelting Smelting in electric arc furnace , which can adjust molten steel composition, reduce the content of harmful elements S, P and improve the purity of molten steel, so that steel shot will have more excellent texture. Forming Forming by high-speed centrifuging and casting, which can effectively control steel shot quality and reduce physical defect. Selection Separating the hollow and profiled particles effectively by selection to improve steel shot density. Quenching Proceeding Secondary Quenching treatment to refine the grain, make products internal microstructure more compact, and enhance the impact toughness. Tempering Further refining internal organization and meet the different hardness requirement. Precise temperature and time control make the organization condition and hardness uniform reach the best. Crushing Special crushing technology make the grit particles have a better fullness and angularity, and furthest reduce the cracks inside of grit particles. Screening Precise size control make the products meet the A