Even before NIPPON STEEL were integrated into NSSMC in 2012, each company positioned steel for cold heading as an important business field and accelerated development of this product line. Our specific product development over years included the addition of a wide variety of customized features, such as ingeniously designed chemical compositions, to conventional steel products based on official industrial standards, and the commercialization of many proprietary steel products. We are ready to offer customers fine-tuned services that will satisfy their processing conditions and product design requirements.
The segment of steel for high strength bolts, which we are now introducing, is one of the major categories of steel for cold forging. Typically, our wire rods will be drawn into wire in customers’ secondary processing and then forged to make finished products. We will continue to meet the needs of customers by a combination of our abundant product variations, which have been broadened after the integration of the two steel makers, and our expansion of global secondary processing networks.
Customer satisfaction
Customer satisfaction
ADS™series [Processing requirements: Phosphorus-free coating recommended]
[Processing requirements: Phosphorus-free coating recommended]
Ease of heat treatment |
Strength | Application | NIPPON STEEL code | Typical chemical composition (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | C | Si | Mn | P | S | Cr | Mo | others | ||||
◎ | ○ -12T |
Flange bolts Hexagon head bolts Connecting rod bolts Cylinder bolts Various bolts for automobile applications Bolts for civil engineering and buildings |
ADS | 1 | 0.33 -0.38 |
0.15 -0.35 |
0.60 -0.85 |
0.015 or less |
0.010 or less |
0.90 -1.20 |
0.20 -0.30 |
- |
2 | 0.33 -0.38 |
0.15 -0.35 |
0.25 -0.45 |
0.010 or less |
0.012 or less |
1.10 -1.30 |
0.35 -0.45 |
Added |
MB™series [Processing requirements: Bolt heat treatment conditions specified, phosphorus-free coating recommended]
[Processing requirements: Bolt heat treatment conditions specified, phosphorus-free coating recommended]
Ease of heat treatment |
Strength | Application | NIPPON STEEL code | Typical chemical composition (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | C | Si | Mn | P | S | Cr | Mo | others | ||||
○ (high-temperature quenching) |
◎ -14T |
Flange bolts Hexagon head bolts Connecting rod bolts Cylinder bolts Various bolts for automobile applications Bolts for civil engineering and buildings |
MB | 12 | 0.35 -0.40 |
0.15 or less |
0.55 -0.75 |
0.015 or less |
0.010 or less |
1.10 -1.30 |
0.15 -0.35 |
Added |
14 | 0.38 -0.42 |
0.1 or less |
0.40 -0.60 |
0.010 or less |
0.010 or less |
1.20 -1.40 |
0.60 -0.80 |
Added | ||||
*MB14: A brand name is Super High-Tension Bolt™ |
DS wire rods / DL wire rods New soft wire rods that will soften "after rolling"
New soft wire rods that will soften "after rolling"
Fabrication method (facility) | DS(Direct Softing)、DL(Direct Low temperature annealing) |
Applications | Bolts, nuts, pins, piston rods, etc. |
Manufacturing process |
Customer satisfaction
Low cost
Possible elimination of the annealing process before secondary wire drawing at the customer's plant
Customer satisfaction
Low cost
Longer life of the drawing dies in secondary processing (*depending on the processing conditions)
EC wire rods New soft wire rods that will soften "after annealing"
New soft wire rods that will soften "after annealing"
Fabrication method (facility) | EC{EDC(Easy Drawing Conveyor)+Controlled Rolling} |
Applications | All applications such as bolts, nuts, pins, and piston rods |
Manufacturing process |
Customer satisfaction
Low cost
Possible elimination of the rough wire drawing process
Customer satisfaction
Higher quality
Longer life of the drawing dies due to the reduced hardness before forging (*depending on the processing conditions)
NHF™ High-strength untempered wire rods (NHF)
High-strength untempered wire rods (NHF)
Fabrication method (facility) | Steel chemical composition design + EDC (easy drawing conveyor) |
Applications | 7T, 8T strengths for hexagon head bolts, flange bolts, etc., 10T, 10.9 strengths for stud bolts, U-bolts, etc. |
Manufacturing process |
Customer satisfaction
Low cost and high quality
Both high strength and the elimination of annealing and quenching / tempering can be achieved at the same time
Customer satisfaction
High quality
Even long bolts can be produced with reduced distortion