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what is 15CrMoG seamless steel pipe ?

15CrMoG seamless steel pipe

First, what is 15CrMoG material?

Wrong wording: 15GrMoG

15CrMoG ( correct reading: 15 chromium molybdenum pot ) is GB5310-95 steel ( equivalent to the Federal Republic of Germany 13CrMo44; corresponding to the world widely used 1Cr-1 / 2Mo and 1 1 / 4Cr-1 / 2Mo-Si steel ), Its chromium content higher than 12CrMo steel, so in the 500-550 ℃ high thermal strength. When the temperature exceeds 550 ° C, its thermal strength is significantly reduced when it is 500-550 ° C long-term operation, does not produce graphitization, but will produce carbide ball and redistribution of alloying elements, which lead to the heat of the steel Strong reduction, steel at 450 ℃ anti-relaxation performance is good. Its pipe and welding process performance is good.

Maximum operating temperature : applied to high and medium pressure boiler steam pipes with steam parameter of 510 ℃ in power station, header and superheater tubes with wall temperature of 540 ℃, forgings and elastic elements.

Executive Standard:

GB 5310-2008 Seamless steel tubes for high pressure boilers

Second, 15CrMoG chemical composition

Steel number	C	Si	Mn	Cr
15CrMoG	0.12 ~ 0.18	0.17 ~ 0.37	0.40 ~ 0.70	0.80 ~ 1.10
	Mo	P	S
	0.40 ~ 0.55	≤ 0.025	≤ 0.015

Third, 15CrMoG mechanical properties

Steel number	Tensile strength (MPa)	Yield strength (MPa)	Elongation(%)	hardness
15CrMoG	440 ~ 640	≥295	≥21	---

Fourth, 15CrMoG steel heat treatment system

Steel number	Heat treatment type
15CrMoG	Normalizing and tempering: normalizing temperature 900 ℃ ~ 960 ℃;tempering temperature of 680 ~ 720 ℃

Note: When the hot-rolled steel finishing temperature in line with the provisions of the normalizing temperature, hot-rolled can be used instead of normalizing.

Fifth, 15CrMoG welding materials selection principle

Manual welding using E5515-B2 (hot 307) electrode.

Gas welding with H12CrMo or H15CrMo wire, automatic welding with H15CrMo wire and flux 250 .

Sixth , 300,000 units of materials used parts specifications table

Schedule 1: The main structure of the heating surface data

Part Name	Pipe specifications	Pipe material	Tube screen number
Furnace water wall	Φ63.5 × 7.5 (with female pipe)	SA-210C
Full screen superheater	Φ51 × 7	12Cr1MoVG, SA-213T91	6 × 4
Screen superheater	Φ60 × 9, Φ54 × 8.5	12Cr1MoVG, SA-213T91, SA-213TP347H	18
High temperature superheater	Φ54 × 7.5, Φ54 × 9, Φ51 × 8, Φ51 × 9, Φ54 × 11	12Cr1MoVG, SA-213T91, SA-213TP347H, SA-213TP304H, SA-213T22	27
Low temperature superheater	Φ51 × 6	SA-210C, 15Mo3 15CrMoG,	98
Roof superheater	Φ48.5 × 6	15CrMoG
Wall overheating	Φ51 × 6, Φ51 × 7, Φ60 × 11	SA-210C
Low temperature reheater	Φ60 × 5, Φ60 × 4, Φ63.5 × 6	SA-210C, 15CrMoG, 12Cr1MoVG	98
High temperature reheater	Φ60 × 4, Φ60 × 5	12Cr1MoVG, SA-213T91, SA-213TP304H, SA-213T22	54
Economizer	Φ51 × 6	SA-210C	105

Schedule 2: reheater system header specifications

Serial number	Name	material	specification
1	Low temperature reheater import header	20G	φ558.8 × 30
2	Low temperature reheater outlet header	12Cr1MoVG	φ508 × 20
3	High temperature reheater import header	12Cr1MoVG	φ508 × 20
4	High temperature reheater outlet header	12Cr1MoVG	φ711 × 40
5	Low to high then connect the tube	12Cr1MoVG	φ609.6 × 25
6	Reheater water desuperheater	12Cr1MoVG	φ609.6 × 25

Schedule III: Superheater system header and its connecting pipe

Serial number	Name	Specifications	Material
1	Ceiling superheater import header	φ273 × 45	20G
2	Ceiling superheater outlet header	φ355.6 × 60	20G
3	Side-wall wall header	φ355.6 × 60	20G
4	In the wall on the header	φ273 × 50	20G
5	Ring header (side)	φ355.6 × 60	20G
6	Ring header (front)	φ355.6 × 60	20G
7	In the wall under the box	φ355.6 × 60	20G
8	After the package under the wall box	φ355.6 × 60	20G
9	Lower than the import header	φ355.6 × 65	20G
10	Lower than the export header	φ406.4 × 50	12Cr1MoVG
11	Low to large screen connection tube	φ609.6 × 55	12Cr1MoVG
12	Superheater a desuperheater	φ609.6 × 55	12Cr1MoVG
13	Big screen import header	φ323.9 × 40	12Cr1MoVG
14	Big screen export header	φ368 × 45	12Cr1MoVG
15	Superheater secondary desuperheater	φ426 × 50	12Cr1MoVG
16	After the screen import header	φ323.9 × 40	12Cr1MoVG
17	Rear screen exit header	φ355.6 × 50	12Cr1MoVG
18	Superheater three desuperheater	φ406.4 × 50	12Cr1MoVG
19	Higher than the import header	φ355.6 × 50	12Cr1MoVG
20	Higher than the export header	φ609.6 × 110	12Cr1MoVG
twenty one	Saturated steam leads to the tube	φ159 × 18	20G
twenty two	Bypass pipe	φ159 × 18	20G
twenty three	After the shaft to the wall after the wall to connect the pipe	φ159 × 20	20G

Supercritical unit water wall material selection recommendations

1, boiler design outlet temperature ≤ 570 ℃, optional 12CrMoG, 15CrMoG, 12Cr1MoVG and similar to their steel pipe as a water wall steel.

2, the boiler outlet temperature design ≤ 600 ℃, optional 12Cr1MoVG, T23, T24 steel pipe as water wall steel.

3, the boiler design outlet temperature ≤ 620 ℃, optional T23, T24 steel pipe as water wall steel.

Shanghai Boiler Plant introduced Siemens boiler manufacturing technology, is currently being manufactured ultra-supercritical boiler water wall steel: SA209-T1, SA213-T12, SA213-T23; Harbin Boiler Factory introduced Japan's Mitsubishi boiler manufacturing technology, is currently being manufactured Ultra-supercritical boiler water wall steel: 15CrMoG; Dongfang Boiler Factory introduced Japan's Hitachi boiler manufacturing technology, is currently being manufactured ultra-supercritical boiler water wall steel: SA213-T12, SA213-T2, SA213-T22; Beijing Babcock is currently manufacturing ultra-supercritical boiler water wall steel: SA213-T12, 15CrMoG.

Related high pressure boiler seamless steel pipe product recommendation:

20G

SA-210C

12Cr1MoVG

SA-213T91

SA-213TP304H

SA-213TP347H

SA-213T22

12Cr2MoWVTiB

09CrCuSb

10CrMo910