1. chemical composition and technicial property

Standard	Grade	C max	Mn max	Si max	P	S	Yield strength max	Tensile strength	Elongation%
DIN17100	ST52-3	0.22	1.60	0.55	0.045	0.030	320	490-630	22
EN10025	S355J2	0.22	1.60	0.55	0.045	0.030	255	510-680	22

 

2. pipe picture

 

3. seamless steel pipe grades can be supplied

Seamless Steel pipe grades

Descriptions	Grades
Structural pipe	20# 35# 45# Q345B, 16Mn, Q345B-E, 20Mn2, 25Mn, 30Mn2, 40Mn2, 45Mn2 SAE1018, SAE1020, SAE1518, SAE1045.
Liquid pipe	20# q295b-e, q345b-e
High pressure boiler tube	20G 15MnG 20MnG 15CrMoG, 12Cr1MoVG St35.8, sa106b, sa106c, sa210a, sa210c, A333P2, A333P11, A33P12, A333P22, A33P36, A333P91, A333P92, A335T2, A335T11, A335T12, A335T22, A335T91, A335T23, A335T9
Pipeline	API SPEC 5L, X42, X52, X60, X65,X70,X80 ASTMA53, ASTM A106, ASTM A333, BS301, BS3602, BS3603, BS3604, PSL1, PSL2, DNV-OS-F101, CSA-Z245
Alloy pipe	4140, 42CrMo, 32CrMo, 15CrMo,
Packing	Black paint, Varnish painting, Tarpaulin packing
End	Common round end, beveled.
Processing	Galvanizing; cutting; making thread outside the pipe; Machining.

 

4. seamless pipe production procedure and methods:

1. Hot rolled seamless steel pipe 

using hot rolled steel pipe billet to make heating and piercing, elongating, sizing and stranghtening, cooling, finally hollow bars finished, this is the type most commonly used. Because it is hot rolled, so cost is lowest, but it is suit for large quantity, for small quantity, have to make cold drawn or round bar piercing. size: outer diameter 32mm- 499mm, wall thickness 4mm- 80mm

2. Cold drawn seamless steel pipe

 for outer diameter not over than 63.5mm, small size hollow bar, when demanded quantity is under 5 tons, usually make cold drawn hollow bar, using larger size hot rolled hollow bar to draw to the size demanded.

some size can be finished only by one time drawing, but some other sizes might need twice or three times to finish drawing, it takes time, so the cost is higher.

cold drawn size outer diameter 16mm- 63.5mm

3. Hot- expanding seamless steel piper

 For hollow bar sizes are special, not common sizes, have to use smaller thick wall hollow bar to hot expand to be larger size hollow bar, but the technical property for hot-expanded hollow bar will be lower than the original hollow bar. Size: outer diameter over 356mm.

5. seamless pipe detail:

 

6. seamless steel pipe stock picture:

 

7. steel pipe fabrication picture

steel pipe tube bending

steel pipe welding