- (+98)081-38331050 // (+98)081-38331080
- 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 |
| 35-40 | 60-65 | 350-420 | 640-680 |
ISO 6892-1 |
|
Al |
Cu | B | Mo | Cr | S | P | Mn | Si | C | Alloy |
|
– |
– | 8ppm | – | – | – | – | 0.7 | – | 0.35 |
.Min |
| 0.005 | 0.1 | 50ppm | 0.01 | 0.1 | 0.02 | 0.02 | 1 | 0.2 | 0.42 |
.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, Iran
Phone: (+98) 021 21000711-12-13-14
Postal code: 1917753759
Hamadan office: No. 17, Corner of Bariri alley , North Saidieh , Hamedan , Iran
Phone: (+98) 081-38331050 / 081-38331080
Postal code: 6516773998
Factory : Vian Industrial Town , Hamedan , Iran
Phone: (+98) 081-38251982 081-38251988
Postal code: 6553171850
admin@nnpm.ir
