Bright easy cut steel small tolerance polishing rod chamfered light round SUM23 grinding rod

SUM23 free cutting steel use: Often used in the manufacture of unimportant standard parts, such as bolts, nuts, pipe joints, spring seats, etc. Electrical parts: motor shaft, fan shaft, sewing machine shaft, etc.

Hardware spare parts: such as guide rails, machine keys, nuts, screws, round nails, hex nails, octagonal nails and a variety of different specifications of standard parts; Automobile, motorcycle spare parts, etc.

The SUM23 free cutting steel complies with JIS G 4804-1999

Chemical composition:

Carbon C: 0.09

Manganese Mn: 0.75 to 1.05

P: 0.04 ~ 0.09

Sulfur S: 0.26 ~ 0.35 

● Mechanical properties:

Tensile strength σb (MPa) : (hot rolled)390 ~ 540; (cold drawn) steel thickness or diameter 8 ~ 20 :530 ~ 755; >20 ~ 30 hours :510 ~ 735; >30 hours :490 ~ 685

Elongation δ5 (%) : (hot rolling)≥22; (Cold rolled)≥7.0

Section shrinkage (%) : (hot rolling)≥36

Hardness: (hot rolling)≤170HB; (cold drawn) 152-217HB

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