DIN1629 Carbon Seamless Steel Pipe DIN 1629 is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements. Din 1629 seamless steel pipes application fields are: chemical plant, vessels, pipework construction and for common mechanical engineering purposes. Normally DIN 1629 standard are manufactured with no limiting working pressure values. Working temperature is limited below 300℃.   The main products of steel grade DIN 1629 are

• din1629 ST37.0
• din1629 ST44.0
• din1629 ST52.0

  DIN 2391 ST 37 can be processed as hot rolled, cold rolled, cutting, grinding, machining and forming operations. It has high impact strength due to which it can be used under high impact prone outdoor applications as well. DIN 1629 ST 52 is a low-cost Low Carbon Steel Tubes with max 022 % carbon content easy to form and shape. It is suitable for gas fusion welding, arc welding, flash butt welding, electric pressure welding and gas pressure welding. DIN 1629 part 3 is not only hard, but it also has high tensile properties, which is expected for structural components. It has good weldability properties with its pre-existing chemistry.   Chemical composition:

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% Al total
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

  Mechanical properties:

Steel Grade		Upper Yield Stress ReH for wall thickness, in mm,			Tensile strength Rm N/mm²	Elongation(%) A5
Symbol	Material Number	up to 16	over 16 up to 40	over 40 up to 65		Longitudinal	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
¹) For cold f inished tube in the NBK condition (annealed above the upper transformation point under shielding gas or in a vacuum), minimum values of yield stress lower than these valued by 20N/mm² are permitted. ²) For cold finished tubes in the NBK condition, minimum values of tensile strength lower than these values by 10N/mm² are permitted.