Question about steel

[Alexey]

This actually surpass what I use.

SEAMLESS 4130 ALLOY STEEL TUBING
TW’s cold drawn seamless 4130 tubing is a lighter weight, higher strength alternative to carbon steel. As the market leader in seamless 4130 tubing, TW Metals delivers a full range of rounds, squares, rectangles, and streamline products. Our tubing is manufactured to Mil-T-6736B, AMS-T-6736, ASTM A519, and AMS 6360 specifications.

APPLICATIONS OF 4130 TUBING

• Aerospace
• Motorsports - chassis

ADVANTAGES OF 4130 TUBING

• Excellent weldability
• High yield strength
• High ultimate tensile strength

Typical Chemical Properties
Carbon Max 0.33
Manganese Max .60
Phosphorous Max 0.025
Sulfur Max 0.025
Silicon Max 0.35
Chromium Range .80-1.10
Molybdenum Range .15-.25
Typical Mechanical Properties
Tensile Strength Min 90,000 psi
Yield Strength Min 80,000 psi
Elongation Min 10%
Hardness Min 95 HRB
TW Metals offer as wide range of stock sizes and processing capabilities for your company’s 4130 tubing needs. We stock .1875” OD – 5” OD with wall thicknesses .028” thru .625” wall.

This steel is well suited for forks. Only in Russian catalogs, this steel has special conditions for welding. This is limited weldability. And in the American catalog it is welded without restrictions. That's what scares me. Various contradictory information.

 

[liferider]

Preheat it. Use a temp stick and bring both areas up to 1200* weld the joint then pack it in Lime for 24 hrs.

 

[pauldeepsea]

This steel is well suited for forks. Only in Russian catalogs, this steel has special conditions for welding. This is limited weldability. And in the American catalog it is welded without restrictions. That's what scares me. Various contradictory information.

Alexey,
The App Store has a Miller app that provides a ton of useful welding information for all processes and metals.
I agree with liferider that tungsten tig would be the way to go on the smaller tubing. It does not produce as much heat which will aid in less distortion. Although skill wise it is probably the hardest technique.
Good luck


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[john sachs]

This actually surpass what I use.

SEAMLESS 4130 ALLOY STEEL TUBING
TW’s cold drawn seamless 4130 tubing is a lighter weight, higher strength alternative to carbon steel. As the market leader in seamless 4130 tubing, TW Metals delivers a full range of rounds, squares, rectangles, and streamline products. Our tubing is manufactured to Mil-T-6736B, AMS-T-6736, ASTM A519, and AMS 6360 specifications.

APPLICATIONS OF 4130 TUBING

• Aerospace
• Motorsports - chassis

ADVANTAGES OF 4130 TUBING

• Excellent weldability
• High yield strength
• High ultimate tensile strength

Typical Chemical Properties
Carbon Max 0.33
Manganese Max .60
Phosphorous Max 0.025
Sulfur Max 0.025
Silicon Max 0.35
Chromium Range .80-1.10
Molybdenum Range .15-.25
Typical Mechanical Properties
Tensile Strength Min 90,000 psi
Yield Strength Min 80,000 psi
Elongation Min 10%
Hardness Min 95 HRB
TW Metals offer as wide range of stock sizes and processing capabilities for your company’s 4130 tubing needs. We stock .1875” OD – 5” OD with wall thicknesses .028” thru .625” wall.

Back when I was building " Jap" bike frames, swing arms, and wheelie bars, 4130 it's what I always used. Never pre-heated it, never had any problems with cracks, or breakage. Quite a few 200 mile an hour, 6 second 1/4 mile bikes.
John