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DIN 1629-84 SEAMLESS CIRCULAR TUBES OF NON ALLOY STEELS WITH SPECIAL QUALITY REQUIREMENTS
(DIN1629-84) |
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Nahtlose kreisformige Rohre aus unlegierten Stahlen fur
besonders hohe Anforderungen; technische Lieferbedingungen |
supersedes DIN 1629 Part
january 1961 edition
and parts of DIN 1629 Part
january 1961 edition |
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 ( cast analysis) 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
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