custom Bicycle forks 4130 crmo material alloy small diameter seamless steel tube

4130 Alloy Chromoly Steel Pipe

Chemical Composition(%)									Mechanical Property
C	Si	Mn	S	P	Cr	Ni	Cu	Mo	Yield Strength	Tensile Strength
									( σs )	( σb )
0.28~0.33	0.15~0.30	0.40~0.60	≤0.04	≤0.035	≤0.15	0.80~1.10	/	0.15~0.25	≥785(80) (MPa)	≥930(95)
										(MPa)
End Shape	Beveled end, plain end, vanished, or adding plastic caps to protect the two ends as per customer’s requirements
Surface	Oiled, Galvanized, Phosphate etc
Treatment
Technique	Cold drawn
Application	1. Automotive and mechanical pipes
	2. Petroleum cracking pipes
	3. High Pressure Boiler Pipe
	4. Low and middle pressure fluid transportation pipeline
	5. Chemical fertilizer equipment pipes
	6. Heat exchanger pipes
Delivery	1. BK (+C)	No heat treatment after last cold forming process.
Conditions	2. BKW (+LC)	After last heat treatment there is a light finishing pass (cold drawing)
	3. BKS (+SR)	After the final cold forming process the tubes are stress relieve annealed.
	4. GBK (+A)	After the final cold forming process the tubes are annealed in a controlled atmosphere.
	5. NBK (+N)	After the final cold forming process the tubes are annealed above the upper transformation point in acontrolled atmosphere.
Package	1. Bundle Packing.
	2. Plain end or vanished as per customer’s request.
	3. Wrapped in waterproof paper.
	4. Sackcloth with several steel strips.
	5. Pack in heavy tri-wall boxes