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DIN1629 Round hollow sections st44 st52 tube hot rolled pipes

DIN1629 Round hollow sections st44 st52 tube hot rolled pipes

Category:

Steel Tube

Brief description:

DIN 1629 carbon steel tube hot rolled pipes circular tubes and pipes.

Key words:

Product Description

Standard	DIN1629
Grade	St37 St44. St52
Technical	cold-drawn or cold-rolled,or hot rolled thermal expansion . Seamless.
Application	Pipeline steel pipe, vessel steel pipe, fluid pipe for low&medium pressure boiler
Outside Diameter	20mm-1200mm
Wall Thickness	2mm-200mm
Length	4m-12m or as required
Surface:	Bared or painted, galvanized or with oiled or client option.
Package	Oil dipped surface, small diameter packed in wooden boxes, large diameter wrapped with woven bags, tied with steel strips
Shippment	20'GP/40'GP/40'HQ FCL or LCL
Incoterms	EXW,FOB, CFR,CIF
Delivery	Depends on the stock availability and actual order quantities.

Chemical composition:

Standard	Steel Grade		Type of deoxidization (R, killed (including semi-killed)) (RR,fully killed)	Chemical Composition, % by mass
Standard	Symbol	Material Number		C	P	S	N¹)	Addition of nitrogen fixing elements (e.g.not less than 0,020% Al total
DIN2391	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	Tensile strength Rm N/mm²	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

Elevated temperature upper yield stress values of DIN 1629 Steel Pipe

Steel Grade	Yield stress value by working temperature(Thickness increasing)
Steel Grade	50℃	200℃	250℃	300℃
St 37	235-215	185-170	165-150	140-130
St 44	275-255	215-200	195-180	165-155
St 52	355-335	248-230	225-210	195-185

Mechanical Properties(Mpa)

Steel grade	BK		BKW		BKS				GBK			NBK
Steel grade	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
St37	480	6	420	10	420	315	14	315		25	340-470		235	25
St44	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

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.)