JIS G3429 Seamless tubes for high pressure gas cylinder

JIS G3429 seamless steel tubes are used for the manufacture of seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.

Standards: JIS G3429

Size (mm):

Application: Seamless steel tubes for high pressure gas cylinder.

The main products of steel / steel grade:

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements.

Painting: as requested.

Chemical Compositions(%):
Grade C Si Mn P S Ni Cr Mo
STH11 ≤0.50 0.10-0.35 ≤1.80 ≤0.035 ≤0.035 / / /
STH12 0.30-0.41 0.10-0.35 1.35-1.70 ≤0.030 ≤0.030 / / /
STH21 0.25-0.35 0.15-0.35 0.40-0.90 ≤0.030 ≤0.030 ≤0.25 0.80-1.20 0.15-0.30
STH22 0.33-0.38 0.15-0.35 0.40-0.90 ≤0.030 ≤0.030 ≤0.25 0.80-1.20 0.15-0.30
Tolerances:
Tolerance Data
Outside diameter: 1%
Wall thickness: +30%
Wall thickness disparity: Within 20% of the nominal wall thickness
Length: >+30mm

Note: the tolerance is not available for WT<5.6mm tubes

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube.

The tubes shall be free from defects detrimental to practical use.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

Delivery status Abbreviation Description

Cold-finished/hard
(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery according to actual weight or delivery according to theoretical weight

  • Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;
  • Theoretical weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel.
 


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