This standard applies to seamless steel pipe used in high-temperature environments, steel pipe material is heat-resistant steel, can maintain good mechanical properties and corrosion resistance at high temperatures. Steel pipe is manufactured by hot rolling or cold drawing process. Heat treatment such as normalizing, annealing or quenching and tempering is required to ensure its high temperature performance.

Product Size

Outer diameter: 21.3～610mm
Wall thickness: 2.77～70.00mm
End: Flat end, beveled or threaded for selection
Length: 3 to 12 meters or SRL, DRL, double-footed and fixed-footed

Product Packaging

Exterior surfaces varnished clear/black, hot-dipped galvanized or corrosion-resistant (FBE, 3LP, 3LPP) optional, steel strapping.

Chemical composition

Steel Type		Chemical composition % (wt)									Colors①
Abbreviations	Material No.	C	Si	Mn	P	S	Cr	Mo	Ni	V	Colors①
St35.8	1.0305	≤0.17	0.1-0.35②	0.40-1.30	0.040	0.040					White
St45.8	1.0405	≤0.21	0.1-0.35②	0.40-1.20	0.040	0.040					Yellow
17Mn4③	1.0481③	0.14-0.20	0.20-0.40	0.90-1.20	0.040	0.040	≤0.30				Red and Black
19Mn5③	1.0482③	0.17-0.22④	0.30-0.60	1.00-1.30	0.040	0.040	≤0.30
15Mo③	1.5415	0.12-0.20④	0.10-0.35	0.40-0.80	0.035	0.035		0.25-0.35
13CrMo44	1.7335	0.10-0.18④	0.10-0.35	0.40-0.70	0.035	0.035	0.70-1.10	0.45-0.65
10CrMo910	1.7380	0.08-0.15	≤0.50	0.40-0.70	0.035	0.035	2.00-2.50	0.90-1.20
14MoV63	1.7715	0.10-0.18	0.10-0.35	0.40-0.70	0.035	0.035	0.30-0.50	0.50-0.70		0.22-0.32
X20CrMoV121	1.4922	0.17-0.23	≤0.50	≤1.0	0.030	0.030	10.00-12.50	0.80-1.20	0.30-0.80	0.25-0.35
① Generally, the tube is marked at both ends with the indicated ring color markings. The indicated color markings may also be applied to the entire length of the tube upon request and as agreed upon at the time of order. ② If the steel is sedated with aluminum or deoxidized in a vacuum, a silicon content of less than the lower limit of 0.10% is permitted. ③ This steel may only be considered as tubes for containers. ④ The carbon content is allowed to increase by 0.02% when the tube wall is ≥ 30 mm.

Product Mechanical Properties

If the wall thickness exceeds 65 mm, the value must be agreed upon at the time of ordering.

Steel Type		Tensile strength N/mm²	Yield strength ①, ② Wall thickness, mm			延伸率(L-5do)		Notched Impact Work (DVM I specimen)
Abbreviations	Material No.		≤16	＞6≤40	＞40≤60	vertically	vertical	vertical
Abbreviations	Material No.		N/mm²minimum value			% minimum value		∂ minimum value
St35.8	1.0305	350-480	235	225	215	25	23	34
St45.8	1.0405	410-530	255	245	235	21	19	27
17Mn4	1.0481	460-580	270	270	260	23	21	34
19Mn5	1.0482	510-610	310	310	300	19	17	34
15Mo3	1.5415	450-600	270④	270	260	22	20	34
13CrMo44	1.7335	440-590	290④	290	280	22	20	34
10CrMo910	1.7380	450-600	280	280	270	20	18	34
14MoV63	1.7715	460-610	490	320	310	20	18	41
X20CrMoV121	1.4922	690-540	235	490	490	17	14	34④
① wall thickness ≤ 3mm, outside diameter ≤ 30mm tube, the minimum value can be reduced by 10N/m ㎡ ②) If the wall thickness > 60mm, for St35.8, St45.8, 17Mn4, 19Mn5, 15M03 and 14MoV63 steel grade made of pipe values can be agreed upon;. If the wall thickness of > 60 to ≤ 80mm on the 13CrMo44 steel pipe minimum value of 270N/m ㎡ and 10CrMo910 steel for 260N/m ㎡, the minimum value of X20CrMoV121 steel pipe can be 490 N/m ㎡. ③ For longitudinal specimen test (see Section 8.5.3), the minimum value of notched impact work can be increased by 14J. ④ For wall thickness ≤10 mm, the minimum value shall be increased to 15 N/m㎡. ⑤) The minimum value can be reduced to 27J for hot rolled steel tubes.