DIN 2458 Steel Pipes come with an outer diameter range from 10.2mm to 2020mm and wall thickness from 1.6mm to 20mm. The material has carbon, silicon, nitrogen, phosphorus and sulfur in the composition. This carbon steel gets its mechanical properties from the material composition. The pipes have grade symbols and material numbers to be distinguished from other carbon steel grades.

The symbol is St37.2 and the DIN 2458 Material number 1.0037. The material can also have an addition of nitrogen fixing elements to strengthen the products. The pipes are made through seamless, welding and ERW methods. The Cs DIN 2458 Seamless Pipe ends can range as beveled, plain or coupling types.

The outer diameter and wall thickness tolerances of DIN 2458 steel pipes are strictly controlled and can meet the requirements of high-precision machining. The surface of the steel pipe is smooth, free of defects such as cracks, folds, and scars, which is conducive to subsequent processing and use. In hydraulic systems, steel pipes with smooth surfaces can reduce fluid resistance and improve system efficiency. They have high strength and toughness and can withstand greater pressure and impact loads.

The DIN 2458 standard mainly stipulates the dimensions, tolerances, technical requirements, test methods, markings, packaging, etc. of cold-drawn or cold-rolled precision seamless steel pipes. This type of steel pipe is suitable for mechanical engineering, automobile manufacturing, hydraulic systems, instrumentation and other fields that have high requirements for dimensional accuracy and surface quality.

What material is DIN 2458 steel pipes made of?

The materials of DIN 2458 steel pipes are mainly carbon steel, alloy steel, stainless steel, etc. Steel pipes of different materials have different chemical compositions and performance characteristics, and are suitable for different working environments and requirements.

Carbon steel: It has a low carbon content, good welding performance and processing performance, and is often used in general mechanical structures and engineering fields.

Alloy steel: On the basis of carbon steel, some alloy elements such as chromium, molybdenum, nickel, etc. are added to improve the strength, hardness, wear resistance and corrosion resistance of the steel pipe. It is often used to manufacture parts that withstand high pressure and temperature.

Stainless steel: It contains high alloy elements such as chromium and nickel, has excellent corrosion resistance, and is suitable for industries with high corrosion resistance requirements such as chemical, food, and medicine.

What is DIN standard for pipes?

2448 Seamless Steel Pipes: 2448 is a standard that specifies the dimensions and technical requirements for seamless steel pipes used in general engineering purposes.  They are known for their precision in dimensions, high tensile strength, and excellent resistance to pressure and corrosion.

1629 Steel Pipes: 1629 is a standard that covers non-alloy steel tubes used in applications requiring high tensile strength and resistance to extreme conditions.

17175 Heat-Resistant Steel Pipes: 17175 specifies the technical delivery conditions for seamless steel pipes used in elevated temperature service.  

EN 10216-2 Steel Pipes: EN 10216-2 is a European standard that specifies the technical delivery conditions for seamless steel pipes used in pressure purposes.

DIN 2458 Steel Pipe Specification

Standard	DIN2458
Procedure	ERW, LSAW, SSAW
Dimensions	10.2mm – 2020mm
	DN6 – DN2000
Thickness	1.6mm – 20mm
Unit Length	specific, random
Steel Grade	st37-2
Surface Coating	Varnishing, Oiling, Hot Dip Galvanizing
End Type	Square cut, Plain, Bevelled, Threaded, Socket

DIN 2458 Standard Scope

This Standard apples to the dimensions and the conventional masses per unit length of welded steel pipes a according to the technical conditions of delivery as stipulated in DIN1628 Part 1 to part 4, DIN 17172 and DIN 17177.

It also applies to other technical conditions of conditions of delivery in which reference to this Standard is made.

It defines that sector, selected from DIN IS0 4200, within which welded steel pipes are standardized.

It does not apply to precision steel tubes according to DIN 2393 and DIN 2394

Other Relevant Standards

DIN ISO 4200: Seamless and welded steel tubes; general table of dimensions and conventional masses per unit length.

DIN 1626 Part 1: Welded steel pipes in unalloyed and low alloy steels for supply purposes, process plant and tanks; genera specifications, survey, recommendations for use.

DIN 1626 Part 2: Welded steel pipes in unalloyed and low alloy steels for supply purposes, process plant and tanks; pipes for general use (commercial quality, technical conditions of delivery.

DIN 1626 Part 3: Welded steel pipes in unalloyed and low alloy steels for supply purposes, process plant and tanks; pipes with quality specifications, technical conditions of delivery.

DIN 1626 Part 4: Welded steel pipes in unalloyed and low alloy steels for supply purposes, process plant and tanks, specifications, technical conditions of delivery

DIN 17 172 : Steel pipes for long distance pipe lines for combustible liquids and gases; technical conditions of delivery.

DIN 17 177: Electrically pressure-welded tubes of heat-resistant steels;technical conditions of delivery.

Chemical Composition of DIN 2458 St 37.2 Steel Pipe

Steel grade		Type of deoxidation	Chemical composition					Addition of nitrogen fixing elements
Symbol	Material number		Carbon	Silicon	Nitrogen	Phosphorus	Sulfur
			maximum			maximum
St 37.2	1.0037	RR	0.17	—	0.009	0.05	0.05	—

Carbon in DIN 2458 steel pipe is an important element that determines the strength of steel. An appropriate amount of carbon content can improve the strength and hardness of steel, but too high a carbon content will reduce the toughness and weldability of steel. The relatively low carbon content in ST37.2 ensures that it has good toughness and machinability while ensuring a certain strength.

Phosphorus is generally regarded as a harmful element in steel. It will reduce the toughness and weldability of steel, especially in low temperature environments. The presence of phosphorus may cause cold brittleness in steel. Therefore, the phosphorus content is strictly limited in ST37.2.

DIN 2458 Material 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 minimum				% minimum		/ minimum
St 37.2	1.0037	235	225	215	340 to 510	17-26	—	27	—

Yield strength refers to the stress value at which a material begins to undergo significant plastic deformation during stress. The yield strength of ST37.2 indicates that the material can maintain elastic deformation when subjected to a stress not exceeding 235 N/mm². When the stress exceeds this value, the material will begin to undergo irreversible plastic deformation.

The tensile strength in DIN 2458 steel pipe refers to the maximum stress value that the material can withstand in a tensile test. The tensile strength range of ST37.2 indicates that the material can withstand a stress of 360 – 510 N/mm² without breaking during the tensile process. This performance is very important for components that bear tensile loads. Using ST37.2 steel pipes can ensure that these components have sufficient strength and safety during the working process.

DIN 2458 Steel Pipe Dimension

DIN 2458 st37.2 steel pipe sizes are 10.2-2020mm. The following are some of the more commonly used sizes: 33.7mm-114.3mm.

Outside diameter

Standard Wall Thickness 1)

Weight kg/m

Other Wall Thicknesses mm/in Weight kg/m)

mm

TM

in.

g/m

1.8

2

2.3

2.6

2.9

3.2

3.6

4

4.5

5

5.6

6.3

7.1

8

0.072

0.080

0.092

0.104

0.116

0.128

0.144

0.160

0.176

0.192

0.219

0.250

0.281

0.312

33.7*)

2

0.080

1.57

●

●

●

●

●

●

●

●

●

38

2

0.080

1.79

●

●

●

●

●

●

●

●

●

42.4*)

2

0.080

2.01

●

●

●

●

●

●

●

●

●

●

44.5

2

0.080

2.11

●

●

●

●

●

●

●

●

●

●

8.3*)

2.3

0.092

2.63

●

●

●

●

●

●

●

●

●

●

51

2.3

0.092

2.78

●

●

●

●

●

●

●

●

●

●

57

2.3

0.092

3.13

●

●

●

●

●

●

●

●

●

50.3*)

2.3

0.092

3.31

●

●

●

●

●

●

●

●

●

53.5

2.3

0.092

3.50

●

●

●

●

●

●

●

●

●

70

2.6

0.104

4.35

●

●

●

●

●

●

●

●

●

●

76.1*)

2.6

0.104

4.75

●

●

●

●

●

●

●

●

●

●

88.9*)

2.9

0.116

6.20

●

●

●

●

●

●

●

●

●

101.6*)

2.9

0.116

7.11

●

●

●

●

●

●

●

●

108

2.9

0.116

7.57

●

●

●

●

●

●

●

114.3*)

3.2

0.128

8.83

●

●

●

●

●

●

●

* Up to 139.7mm ind,these outside diameters are in conformity with threaded pipe to ISO Recommendation R7;from 168.3mm in conformity with threaded pipe to ANSI B2.1,API Stds 5A,5Land 5LX(without threads)

1）Usually, standard sizes are available from stock,In general,welded tubing and pipe are only manufactured in those sizes for which weights are indicated.Other sizes upon request.English units are conversions of the metric ones.

2）Minimum wall thickness see DIN2440.

What is the difference between ASTM and DIN?

ASTM Standard

ASTM International, known until 2001 as the American Society for Testing and Materials (ASTM), is an international standard organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. Some 12,575 ASTM voluntary consensus standard operate globally.

ASTM, founded in 1898 as the American Section of the International Association for Testing and Materials, predates other standards organizations such as BSI (1901), DIN (1917), ANSI (1918) and AFNOR (1926).

DIN Standard

The Deutsches Institut für Normung, or DIN, is the German national standards organization with significant influence across Europe. It’s renowned for its stringent and comprehensive standards, especially in engineering and technology.

DIN standards are developed with a focus on thoroughness and precision. The process is rigorous, involving a wide range of stakeholders, from industry experts to public authorities.