DIN 1629 Seamless circular unalloyed steel tubes subject to special requirements, EN 10216-1, ASTM A252, BS 4360, NF A 49-311, St52, 1.0421, E355, SA252 Grade 3, 50 B, TU 52-b, structural steel pipe, DIN 1629 St37, DIN 1629 St44, DIN 1629 St52

DIN 1629 Seamless circular unalloyed steel tubes subject to special requirements

Standard: DIN 1629
Equivalent Standard: EN 10216-1, ASTM A252, BS 4360, NF A 49-311

Material: St52, 1.0421
Equivalent Materials: E355, SA252 Grade 3, 50 B, TU 52-b

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %
0.22 max	0.55 max	1.60 max	0.040 max	0.035 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %
500-650	355 min	21 min

Outside Diameter & Tolerance

Outside Diameter, mm	Tolerance, %
OD≤100	±1
100＜OD≤200	±1
OD>200	±1

Wall thickness & Tolerance

Outside Diameter , mm	Wall Thickness, mm	Tolerance, %
OD≤130	WT≤2*S(DIN 2448)	+15/-10
	2S(DIN 2448)＜WT≤4S(DIN 2448)	+12.5/-10
	WT>4*S(DIN 2448)	±9
130＜OD≤320	WT≤0.05*OD	+17.5/-12.5
	0.05OD＜WT≤0.11OD	±12.5
	WT>0.11*OD	±10
320＜OD≤660	WT≤0.05*OD	+20/-15
	0.05OD＜WT≤0.09OD	+15/-12.5
	WT>0.09*OD	+12.5/-10

DIN 1629 applies to seamless circular tubes and pipes made of unalloyed steels St37 (1.0254), St44 (1.0256), St52 (1.0421). These tubes are predominantly used in the construction of chemical plant, vessel, pipework and for general mechanical engineering purpose. The maximum permissible working temperature are 300°C. The maximum permissible working pressure is according to the wall thickness and outside diameter. In Europe, it is replaced by EN 10216-1.

Manufacture: tubes shall be made by the seamless process and shall be cold drawn or hot rolled.
Heat Treatment: tubes manufactured by hot forming shall be supplied in the hot formed condition, to meet with mechanical and technological properties, the requirement for normalizing should be done if necessary. Cold rolled or cold drawn tubes shall be normalized after forming and supplied.
Inspection & Test: tensile test, flattening test, flaring test, NDT, surface inspection and dimension check.

Length: 5800mm; 6000mm; 10000mm; 11800mm; and so on.
Max length: 18000mm

Keyword: seamless steel pipe, seamless steel tube, DIN 1629, EN 10216-1

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