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- admin@nnpm.ir
- Saturday to Wednesday: 8 a.m. to 4 p.m. (Thursday 8 a.m. to 1 p.m.)
Medium carbon steels with boron contents of 8 to 50 ppm are utilized in cold heading process to manufacture miscellaneous types of bolts and nuts. Adding boron in steels can improve hardenability and cold formability simultaneously during manufacturing process of bolts. Two common grades of this group of steel are 10B21 and 10B38 wire rods which are manufactured according to the requirements of ASTM F2282 standard. Chemical and mechanical properties of these grades are indicated in the tables below.
| Production process | Microstructure | Type of product | Standard | Grade |
| Hot rolling | Pearlite+Ferrite | Wire rod | ASTM F2282 | 10B38 |
|
Elongattion |
Reduction of area R.A(%) | Yield strength(MPa) | Tensile strength(MPa) | Tensile test standard |
| 35-45 | 65-70 | 310-350 | 480-550 |
ISO 6892-1 |
|
Al |
Cu | B | Mo | Cr | S | P | Mn | Si | C | Alloy |
|
– |
– | 8ppm | – | – | – | – | 0.8 | – | 0.19 |
.Min |
| 0.005 | 0.1 | 50ppm | 0.01 | 0.1 | 0.02 | 0.02 | 1.1 | 0.12 | 0.23 |
.Max |
|
Max. of ovality |
Available sizes(mm) |
|
0.2mm |
5.5,6.5,8,10,12,14 |
Saturday to Wednesday: 8 a.m. to 4 p.m. (Thursday 8 a.m. to 1 p.m.)
Email : admin@nnpm.ir
Poolad Maad Steel Rolling Co.
Head office: No. 911, Arash West, Tehran, Jordan
Phone : 14-13-12-21000711 021
Postal code : 1917753759
Hamadan office: No. 17, No. 17, corner of Boriri alley , North Saidieh
Phone: 38331050-081 38331080-081
Postal code : 6516773998
Factory : Hamadan, Vyan Industrial Town
Phone: 38251982-081 38251988-081
Postal code : 6553171850
admin@nnpm.ir
