Free cutting steel SUM32 hexagonal cold drawn hexagonal bar

SUM32 free cutting steel is mainly used for making instruments, watch parts, automobiles, machine tools and other machines with small forces and strict requirements for size and finish, and strict requirements for dimensional accuracy and finish

Standard parts with relatively low mechanical performance requirements, such as gears, shafts, bolts, valves, bushings, pins, pipe joints, spring cushions and machine tool screws, plastic molding molds, surgical and dental procedures. Specifically as follows

1. Automatic lathe processing, metal stamping parts processing;

2. Electronic industry, optical fiber connectors, optical disc drives, scanners, medical equipment;

3 Household appliances, instrumentation industry;

4. Office equipment (computers, photocopiers, cameras, fax machines, etc.);

5. Clock components, glasses;

6. Electronic terminal needle, timer, carburetor;

7. Decorations, lighting products, cars, locomotives, chains;

8. Clean car sweepers and toys;

9. Pens, handbag accessories, belt buckle, fishing gear, etc.;

10. Stud bolts, screws, nuts, pipe joints, spring seats, etc.

1. Good processing performance: the product has the characteristics of smooth cutting, excellent material, stable processing, good metallographic organization, stable chemical composition, small deviation, net steel purity, low inclusion content, not easy to damage the tool; Easy to cut on the lathe, tool life and production efficiency are 40%;

2. Good electroplating performance: cutting is very easy; Can drill deep holes, milling deep grooves, etc. The processing efficiency can be much higher than that of Pu steel; The product has good electroplating performance, can replace copper products, and greatly reduce product cost;

3. Good smoothness: the surface finish of the workpiece after machining is good;

Chemical composition:

Carbon C: 0.12 ~ 0.20 

Manganese Mn: 0.60 ~ 1.10

P: 0.040

Sulfur S: 0.10 ~ 0.20

Mechanical property

Tensile strength σb (MPa) : (hot rolled)450 ~ 600; (cold drawn) steel thickness or diameter 8 ~ 20 :570 ~ 785; >20 ~ 30 hours :530 ~ 745; >30 :510 ~ 705

Section shrinkage (%) : (hot rolling)≥30

(hot rolling)≤175HB; (cold drawn)167 ~ 217HB

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