Quick-cut steel 9SMnPb28 hexagonal rod fixed length hexagonal cold-drawn special shape steel

Product name: Free cutting steel

Grade: 9SMnPb28 free cutting steel

Product process: polishing, grinding

Product shape: round rod, hexagonal rod, square rod, shaped material

use

Commonly used in the manufacture of more important mechanical parts, parts such as gears, shafts, bolts, nuts, screws, valves, bushings, pins, pipe joints, standard parts and machine tool screw.

Chemical composition

Carbon C: 0.10

Silicon Si: ≤0.15 or protocol

Manganese Mn: 0.80 ~ 1.20

Sulfur S: 0.23 ~ 0.33

P: 0.05 ~ 0.10

Lead Pb: 0.15 ~ 0.35

Mechanical property

Tensile strength σb (MPa) :

(hot rolled)390 ~ 540;

(cold drawn) steel φ8 ~ 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 steel) 152-217HB

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