Seamless Boiler knowledge Solutions-Hebei zhonghai steel pipe manufacture Co., Ltd.

1. Normative documents quote from the paper following the terms of the passage of the standards used as the standard provisions. Note any dates quote from the paper, All subsequent modifications alone (not including the contents of Correction) or revision shall not apply to the standards, however, According to the standards to encourage the parties to reach an agreement to study the possibility of using these files to the latest version. Those who note the date cited documents, the latest version of the standards apply to.
GGB/T 222 steel samples with the chemical analysis sampling methods and chemical composition to allow deviation
GB/T 226 times lower steel Organization and the flaws etching test
GB/T 228 metallic materials at room temperature tensile test method
GB/T 229 metal Charpy notched impact test method
GB/T 1,979 times lower structural steel and defect classification map
GB/T 2102 pipe inspection admission, packaging, signs and quality certificate
GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometry method (often Regulation)
GB/T 4338 high temperature metal materials tensile test
GB/T 5777 Seamless Steel Tube ultrasonic flaw detection method
GB/ T 10,561 non-metallic inclusions in steel microstructure on evaluation method
GB/T 13,298 metal microstructures test side Metal editing Act 5148 average grain size determination method
ASTM A steel 450-1996, ferrite and austenite steel pipe typically require steel
DIN EN 10236-1994 test tubes of the ring Expanding the pilot
DIN 50115-1991 metal toughness test pilot SEP 1915-199 4 heat-resistant steel longitudinal ultrasonic inspection deficiencies
SEP 1918-1992 horizontal heat pipe defects Ultrasonic Frederick
SEP 1919-1977 experience heat pipe defects stratified Ultrasonic testing
SEP 1925-1980 Steel of the eddy current density test
3. Classification by
3.1 Availability quality steel grades divided into I and III two categories, non-alloy steel pipe made of sub-¢ñ, ¢ó two from the steel pipe made of only III. ¢ñ of 3.2 for low-pressure boilers and other industrial equipment; Class of hypertension and for more pressure on the power plant boilers and other equipment. 4. Size, shape, weight diameter and wall thickness of 4.1
4.1.1 class I and III of the specifications of a table, Tables 2 and 3, as shown in Table
4. Table 1 ¢ñ boiler tube specifications (DIN series) Table 2 ¢ñ boiler tube specifications (GB Series) Table 3 Class III tube pan Specifications (DIN series) Table 4 Class III pot furnace tube specifications (GB Series)
4.1.2 diameter deviation should be allowed Fu Table 5 with the provisions. Table 5 diameter allow deviation

70.0 diameter allow deviation	Pipe diameter da
4.96>100mm	5.27¡À0.90%
¡Ü100mm	¡À0.75% (Minimum ¡À0.5mm)

4.1.3 thickness deviation should be allowed to comply with the provisions of Table 6. Table 6 thickness allow deviation

8.75 Pipe diameter da	Thickness S	Wall thickness to allow deviation
¡Ü130mm	12.2S¡Ü2¡¤Sn	+15% £10%
	2¡¤Sn<S¡Ü4¡¤Sn	+12.5% £10%
	>4¡¤Sn	¡À9%
>130mm	S¡Ü0.05da	+15% £10%
	0.05da<S¡Ü0.11da	¡À12.5%
	S>0.11 da	¡À10%
Note : Sn thickness as a standard (see table 1 ~ Table 4)

4.2 4.2.1 length of the pipe length 6m~12m normally. By mutual agreement of supply and demand, supply 5m~12m length within the scope of cut-to-length steel, length deviation should be allowed to meet the requirements in Table 7. 4.2.2 According to the demand side, by mutual agreement of supply and demand, but also supply other length of the pipe. Table 7 Length Length allow deviation

Length Length m	Length allow deviation mm
¡Ü6	+10 0
>6	+15 0

4.3 configuration 4.3.1 End-pipe ends with the pipe axis vertical, end-of-pipe should be no burr. 4.3.2 pipe curvature shall not exceed the following : Thickness ¡Ü 15 mm wall thickness 1.0mm/m "15mm 1.5mm/m4.4 weight 4.4.1 Pipe according to the actual weight of delivery, can also be delivered theoretical weight. Pipe weight per meter theory was carried out in Table 4 (the density of steel by 7.85kg/dm). 4.4.2 Pipe weight and the actual weight of theory allow deviation : For single pipe to +10% -8% for no less than 10 tons of on-board capacity of 7.5%4.5 labeled with examples ¡À dia steel manufacturers, for 60.3mm diameter, wall thickness of 4.5mm. Quality Level III for the steel marker : Pipe St45.8/ III -60.3 ¡Á 4.5-Q/BQB 201-20035. Technical Requirements 5 . a brand of steel and chemical composition 5.1.2 finished steel chemical composition deviation allowed by the GB/T 222 requirements. 5.1.1 steel grades and chemical composition (melting analysis) should conform to the provisions in Table 8. After consultations between the two sides of supply and demand, but also supply other brands of steel. Table 8 grade steel and chemical composition (melting analysis)

5.2 5.2.1 steel manufacturing methods used by the steel used converter or oxygen furnace smelting. I used billet manufacturing categories of steel pipe and all Class Boiler Tube Steel should be used for ladle furnace. 5.2.2 of the standard hot-rolled steel used mode of production. 5.3 delivery 5.3.1 Pipe state should appropriate the full-length heat-treated steel heat treatment on the recommendation presented in Table 9. Heat Treatment system should fill in the quality certificate. 5.3.2 For St35.8, St45.8,15Mo3 steel, if the hot, to ensure access to some very good uniformity of the state organization can be considered to satisfy the requirements of the appropriate heat treatment. The same premise, 13CrMo44,10CrMo910 steel, it only for tempering. When 12Cr1MoVG hot rolling of steel at a temperature of normalizing temperature range, it may not be normalized. For 14MoV63 and 12Cr2MoWVTiB steel, under any circumstances, Tempering are normalizing + state delivery.

Table 9 on the recommendation of steel heat treatment

Licensing	Is handling fire	Normalizing + tempering
Licensing	Normalizing temperature ¡æ	Normalizing temperature ¡æ	Tempering temperature ¡æ
St35.8	900~930	-	-
St45.8	870~900	-	-
15Mo3	910~940	-	-
13CrMo44	-	910~940	660~730
10CrMo910	-	900~960	700~750
14MoV63	-	950~980	690~730
12Cr1MoVG	-	980~1020	720~760
12Cr2MoWVTiB	-	1000~1035	760~790
Note : normalizing heating, insulation should be conducted until the entire horizontal pipe containing face up to the required temperature. 12Cr1MoVG for insulation thickness by 1min/mm time, but not less than 20min For 12Cr2MoWVTiB insulation thickness by the time 1.5min/mm. but not less than 20 minutes. In tempering, Specimens 10CrMo910 and for the specified temperature for 30 min at least Insulation For 14MoV63. 12Cr1MoVG and 12Cr2MoWVTiB specified temperature insulation at least 1 hour. Insulation from time to the required minimum temperature starts.

5.4 5.4.1 mechanical properties at room temperature, the vertical steel mechanical properties should conform to the provisions of Table 10. 5.4.2 under high temperature, Pipe proportion of the non-extension of the AT intensity data are listed in Appendix A. (information appendix) for reference. 5.4.3 Steel 1% creep limit and lasting intensity limit data are listed in Appendix B (information appendix) for reference
Table 10 vertical room temperature mechanical properties

Licensing,	Tensile Strength Rm,MPa	Air/H2O yield strength, not less than MPa		A Elongation,% not less than	Impact energy J
		Thickness mm			AkU (DVM- sample)	AkV (Charpy V-notch specimens)
		¡Ü16	>16		Not less than
St35.8	360~480	235	225	25	--	-
St45.8	410~530	255	245	21	-	-
15Mo3	450~600	270	270	22	-	-
13CrMo44	440~590	290	290	22	-	-
10CrMo910	450~600	280	280	20	-	-
14MoV63	460~610	320	320	20	55	-
12Cr1MoVG	470~640	255	245	21	-	35
12Cr2MoWVTiB	540~735	345	335	18	-	35
Note : 1. When the yield phenomenon is not apparent to non-proportional extension strength replace AT yield strength. 2. For St35.8, St45.8,15Mo3,13CrMo44. 14MoV63 10CrMo910 steel manufacturers and the diameter of not more than 30mm. not more than 3mm thickness of the pipe, whose minimum yield strength of 10 MPa be low. 3. For 15Mo3. Specimens manufacture of steel thickness is less than 10 mm steel yield strength, higher minimum aging.