EN10216-1 / DIN1629 Precision cold drawn seamless steel tube
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EN10216-1 / DIN1629 Precision cold drawn seamless steel tube

DIN 1629 is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements. The main products of steel grade is DIN1629 ST37.0, DIN1629 ST44.0, DIN1629 ST52.0
Application:
for Atuo usd;for machinery use;
Oil cylinder tube
Motorcycle shock reducer steel tubes
Auto shock reducer inner cylinder
The subclauses marked with a single dot give specifications which are to be agreed upon at the time of ordering.
The subclauses marked with a two dots give specifications which optional and may be agreed upon at the time of ordering.
1. Field of application
1.1 This standard applies to seamless circular tubes and pipes(hereinafter briefly referred to as "tubes") made of unalloyed steels as listed in table 1. These tubes are predominantly used in the constructin of chemical plant, vessels, pipework and for general mechanical engineering purposes. They are designed to meet high performance requirements. Normally there are no limiting vaiues or the maximum permissible working pressure of these tubes. The permissi l working temperature shall not exceed 300℃ are specified in Appendix A.)

The limits of application and other specifications given in this standard shall apply except in cases here other specifications are contained in codes of practice for specific fields of application, e.g. the Technische Regeln fur Dampfkessel (TRD) (Technical rules on steam boilers) or the Technische Regeln fur Druckbehalter (TRB)
(Technical rules on pressure vessels), AD-Merkblatter (AD Instrucation sheets).
Chemical composition of steels for seamless circular tuves subject to special repuirements
steel grade

Type of
deoxidization
(R, killed
(including
semi-killed))
(RR, fully killed)

chemical composition,
% by mass
Symbol
Material number
C
P
S
N¹)
Addition 
of nitrogen
fixing elements
(e.g.not less than 
0,020% AItotal
St37.0
1.0254
R
0.17
0.040
0.040
0.009²)
-
St44.0
1.0255
R
0.21
0.040
0.040
0.009²)
-
St52.0³)
1.0421
RR
0.22
0.040
0.035
-
Yes
¹) A content in excess of the maximum value started is permitted if a phosphorus content less than the maximum specifled by 0,005% P per 0,001% N is observed. However, the nitrogen content shall not exceed a value of 0.012% in the cast analysis and 0,014% in the product analysis.
²) The specified maximum values do not apply if the steels are supplied with the RR (instead of R) type of deoxidization
³) The content shall not exceed 0.55% Si and 1,06% Mn in the cast analysis or 0,60% Si and 1,70% Mn in the product analysis

table 3. Amounts by which the chemical composition in the product analysis may deviate from the limiting values applicable to the cast analysis {see table2}
Element
Amount by which the product analysis
may deviate from the limiting values
applicable to the analysis
% by mass
C
+0,02
P
+0,010
S
+0,010
N
+0,001¹)
¹) A contant in excess of the maximum value stated is permitted if a phosphorus content less than the maximum specified by 0,005% P per 0,001% N is observed. However, the nitrogen contant shall not exceed a value of 0,012% in the cast analysis and 0,014% in the product analysis (this does not apply to the RR type of deoxidization.

table 4. Mechanical properties of tubes in the as delivered condition at room ternperature For wall thickness exceeding 65 mm, the values shall be agreed at the time of ordering
Steel grade
Upper yield stress
ReH
for wall thicknesses, in mm,

Tensile strangth
Rm

N/mm²

Elongation after fracture
A5
Symbol
Material 
number
up to 16
over 16
up to 40
over 40
up to 65
lonigtudinal
transverse
St 37.0
1.0254
235
225
216
350²) to 480
25
23
St 44.0
1.0256
275¹)
265¹)
255¹)
420²) to 550
21
19
St 52.0
1.0421
355
345
335
500²) to 650
21
19
steel-chemical composition (DIN1629):
Brand Chemical Composition(%)
C max Si max Mn P max S max
St 35 0.17 0.35 ≥0.40 0.025 0.025
St 45 0.21 0.35 ≥0.40 0.025 0.025
St 52 0.22 0.55 ≤1.60 0.025 0.025

Steel grade Chemical Composition(%)
Steel name Steel number C max Si max Mn P max S max Al min
E215 1.0212 0.10 0.05 0.70 0.025 0.025 0.025
E235 1.0308 0.17 0.35 1.20 0.025 0.025 -
E355 1.0580 0.22 0.55 1.60 0.025 0.025 -
Mechanical Properties(Mpa):
Steel grade BK BKW BKS GBK NBK
Yield strength Rm N/mm min Elongation% min Yield strength Rm N/mm min Elongation % min Yield strength Rm N/mm min Tensile Strength ReH N/mm min Elongation % min Yield strength Rm N/mm min Elongation % min Yield strength Rm N/mm min Tensile Strength ReH N/mm min Tensile Strength ReH N/mm min
St35 480 6 420 10 420 315 14 315 25 340-470 235 25
St45 580 5 520 8 520 375 12 390 21 440-570 255 21
St52 640 4 580 7 580 420 10 490 22 490-630 355 22

Steel grade Minimum values for the delivery condition
Steel name Steel number + C + LC + SR + A + N
Rm Mpa A% Rm Mpa A% Rm Mpa ReH Mpa A% ReH Mpa A% Rm Mpa ReH Mpa A%
E215 1.0212 430 8 380 12 380 280 16 280 30 290-430 215 30
E235 1.0308 480 6 420 10 420 350 16 315 25 340-480 235 25
E355 1.0580 640 4 580 7 580 450 10 450 22 490-630 355 22


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