Steel A179 boiler pipe DIN 2458

ASTM A179 steel tube covers minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. A179 Cold drawn steel pipe shall be made by the seamless process and shall be cold drawn.

steel A179 boiler pipe DIN 2458

Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur.

Chemistry Composition:
C, %
Mn, %
P, %
S, %
0.06-0.18
0.27-0.63
0.035 max
0.035 max
Mechanical Properties:
Tensile Strength, MPa
Yield Strength, MPa
Elongation, %
Hardness, HRB
325 min
180 min
35 min
72 max

A179 black steel pipe minimum carbon content is 0.06%. The seamless steel tube minimum tensile strength of 325MPa, yield strength of 180MPa.The minimum elongation of A179 seamless pipe is 20%.

steel A179 boiler pipe DIN 2458 Application

A179 seamless steel pipe is widely used in industries such as petroleum, chemical, medical, food, light industry, machinery, instrument, include industrial pipeline and mechanical structure parts, etc.

Standard:ASTM A179

Delivery time :

Main steel A179 boiler pipe DIN 2458.

This is an effective way of metal corrosion, the use of the main features are the following:

  1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable.
  2. With iron - zinc alloy layer, combined with dense, and with the unique anti-corrosion in the marine atmosphere and atmospheric atmosphere.
  3. ASTM A179 cold drawn seamless pipe with a strong wear resistance due to the combination of solid, zinc - iron miscible.
  4. Since zinc has good ductility, its alloy layer and steel base attached to a solid, so hot-rolled parts can be cold, rolling, drawing, bending and other molding without damage to the coating.
  5. Hot-dip galvanized structural steel pipe, the equivalent of an annealing treatment, can effectively improve the mechanical properties of steel matrix to eliminate the steel forming welding stress, is conducive to the steel structure for turning.
  6. The surface of cold drawn seamless pipe after hot galvanized is bright and beautiful.
  7. Pure zinc layer is the most hot galvanized layer of galvanized layer, its nature is basically close to pure zinc, with ductility, so it is full of flexibility.
Outside Diameter & Tolerance of steel A179 boiler pipe DIN 2458
Outside Diameter, mm
Tolerance, mm
3.2≤OD<25.4
±0.10
25.4≤OD≤38.1
±0.15
38.1<OD<50.8
±0.20
50.8≤OD<63.5
±0.25
63.5≤OD<76.2
±0.30
76.2
±0.38
Wall thickness & Tolerance of steel A179 boiler pipe DIN 2458
Outside Diamter, mm
Tolerance, %

3.2≤OD<38.1

+20/-0
38.1≤OD≤76.2
+22/-0

DIN 2458

DIN 2458 Standard applies to the dimensions and the conventional masses per unit length of welded steel pipes according to the technical conditions of delivery as stipulated in DIN

DIN 2458

1628 Part 1 to part 4, DIN 17172 and DIN 17177. St37.2 welded pipe also applies to other technical conditions of conditions of delivery in which reference to DIN2458 standard is made.

Chemical composition
Steel grade Type of deoxidation (RR.fully killed) Chemical composition, % by mass Addition of nitrogen fixing elements
(e.g.no less than 0.020% Al total)
Symbol Material number C Si N P S
max max
St 37.2 1.0037 RR 0.17 -- 0.009 0.050 0.050 --

 

Mechanical property
Steel grade Upper yield stress Reh for wall thickness in mm Tensile N/mm2 Elongation after A5 Impact ISO V-notch test pieces at+20°C
Symbol Material number Up to 16 16-40 40-65 longitudinal transverse longitudinal transverse
N/mm2 min % min / min
St 37.2 1.0037 235 225 215 340 to 510 17-26 --- 27 --


It defines that sector, selected from DIN ISO 4200, within which welded steel pipes are standardized.It does not apply to precision steel tubes according to DIN 2393 and DIN 2394.



Seamless pipe Specification, standard and identification

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.



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