• Standards of seamless steel pipe

• DIN
  Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
  Seamless Steel Tubes for Elevated Temperature	DIN 17175	Ø10~762 x WT1.0~120	St35.8, St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
  Seamless Steel Tubes	DIN 1629 / DIN 2391	Ø13.5~762 x WT1.8~120	St37.0, St44.0, St52.0, St52.3
  Seamless Steel Tubes	DIN 2440	Ø13.5~165.1 x WT1.8~4.85	St33.2
  Seamless Steel Pipes for Structural Purpose	DIN 2393	Ø16~426 x WT1.0~36	RSt34-2, RSt37-2, RSt44-2, St52

• DIN 17175 German standard (boiler tubes made of heat-resistant steel)
  Standard:
  DIN 17175 ---- German Industry Standard
  Purpose:
  Applicable to boiler industry pipelines.
  Major steel pipe brands:
  St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910 and so on.
  Upon consultation, other grades of steel pipes can also be supplied.
  Mechanical behavior:

  Standard	Grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation(%)
  DIN 17175	St35.8	360~480	≥235	≥25
  	St45.8	410~530	≥255	≥21
  	15Mo3	450~600	≥270	≥20
  	13CrMo44	440~590	≥290	≥20
  	10CrMo910	450~600	≥280	≥18

  
  Chemical Composition:

  Standard	Grade	Chemical composition limits,%
  		C	Si	Mn	P,S	Cr	Mo
  DIN 17175	St35.8	≤0.17	0.10~0.35	0.40~0.80	≤0.030	/	/
  	St45.8	≤0.21	0.10~0.35	0.40~1.20	≤0.030	/	/
  	15Mo3	0.12~0.20	0.10~0.35	0.40~0.80	≤0.030	/	0.25~0.35
  	13CrMo44	0.10~0.18	0.10~0.35	0.40~0.70	≤0.030	0.70~1.10	0.45~0.65
  	10CrMo910	0.08~0.15	≤0.50	0.40~0.70	≤0.030	2.00~2.50	0.90~1.20

  
  Remarks:

  HR:hot rolled	CW:cold worked	SR:stress relieved
  A:annealed	N:normalized	HF

  

• Heat treatment temperature of DIN 17175 St45.8 seamless steel tubes

  Steel Grade		Thermal processing ºC	NormalizingºC	Tempering
  Grade	Material number			Quenching temperature ºC	Tempering temperature ºC
  St45.8	1.0405	1100 to 850°C	870-900	-	-

  Chemical composition of DIN 17175 St45.8 seamless steel tubes

  Grade	Chemical composition
  	C	Si	Mn	P,S	Cr	Mo
  St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.030	/	/

  Mechanical property of DIN 17175 St45.8 seamless steel tubes

  Standard	Grade	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation(%)
  DIN 17175	St45.8	410-530	≥255	≥21

  Detailed Photos
  

  
  

  
  

  
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