What is Alloy Tubing?

Alloy pipe is a type of seamless steel pipe. Its performance is much higher than that of ordinary seamless steel pipes, because this steel pipe contains more Cr, and its high temperature, low temperature and corrosion resistance are other The seam steel pipe is incomparable, so the alloy pipe is widely used in petroleum, aerospace, chemical, power, boiler, military and other industries.

Alloy tube

Alloy pipe is

Alloy pipe is a type of seamless steel pipe. Alloy pipes are divided into structural seamless pipes and high-pressure heat-resistant alloy pipes. Mainly different from the production standards and industry of alloy pipes, annealing and tempering of alloy pipes change its mechanical properties. To achieve the required processing conditions. Its performance is higher than that of ordinary seamless steel pipes. It has higher variability utilization value, alloy pipe contains more Cr in chemical composition, and has high temperature resistance, low temperature resistance and corrosion resistance. Ordinary carbon seamless pipes do not contain alloy components or have very few alloy components. The reason why alloy pipes are widely used in petroleum, aerospace, chemical, power, boiler, military, and other industries is because the mechanical properties of alloy pipes change and adjust well.

standard	Grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation(%)	hardness
GB3087	10	335 475	195	24	/
20	410 550	245	20	/
GB5310	20G	410 550	245	24	/
20MnG	415	240	22	/
25MnG	485	275	20	/
15CrMoG	440 640	235	21	/
12Cr2MoG	450 600	280	20	/
12Cr1MoVG	470 640	255	21	/
12Cr2MoWVTiB	540 735	345	18	/
10Cr9Mo1VNb	585	415	20	/
ASME SA210	SA210A-1	415	255	30	143HB
SA210C	485	275	30	179HB
ASME SA213	SA213 T11	415	205	30	163HB
SA213 T12	415	220	30	163HB
SA213 T22	415	205	30	163HB
SA213 T23	510	400	20	220HB
SA213 T91	585	415	20	250HB
SA213 T92	620	440	20	250HB
DIN17175	ST45.8 /	410 530	255	21	/
15Mo3	450 600	270	22	/
13CrMo44	440 590	290	22	/
10CrMo910	480 630	280	20	/

standard	Grade	chemical composition(%)
C	Si	Mn	P	S	Cr	Mo	Cu	Ni	V	Al	W	Ti	Nb	N
GB3087	10	0.07 0.13	0.17 0.37	0.38 0.65	0.030	0.030	0.3 0.65	/	0.25	0.30	/	/
20	0.17 0.23	0.17 0.37	0.38 0.65	0.030	0.030	0.3 0.65	/	0.25	0.30	/	/
GB5310	20G	0.17 0.24	0.17 0.37	0.35 0.65	0.030	0.030	0.25	0.15	0.20	0.25	0.08
20MnG	0.17 0.24	0.17 0.37	0.70 1.00	0.030	0.030	0.25	0.15	0.20	0.25	0.08
25MnG	0.18 0.24	0.17 0.37	0.80 1.10	0.030	0.030	0.25	0.15	0.20	0.25	0.08
15CrMo	0.12 0.18	0.17 0.37	0.40 0.70	0.030	0.030	0.80 1.10	0.40 0.55	0.20	0.30
12Cr2MoG	0.08 0.15	0.50	0.40 0.70	0.030	0.030	2.00 2.50	0.90 1.20	0.20	0.30
12Cr1MoV	0.08 0.15	0.17 0.37	0.40 0.70	0.030	0.030	0.90 1.20	0.25 0.35	0.20	0.30	0.15 0.30
12Cr2MoWVTiB	0.08 0.15	0.45 0.75	0.45 0.65	0.030	0.030	1.60 2.10	0.50 0.65	0.20	0.30	0.28 0.42		0.30 0.55	0.08 0.15	B 0.002 0.008
10Cr9Mo1VNb	0.08 0.12	0.20 0.50	0.30 0.60	0.020	0.010	8.00 9.50	0.85 1.05	0.20	0.40	0.18 0.25	0.015			0.06 0.10	0.03 0.07
ASME SA210	SA210A-1	0.13 0.19	0.1	0.45 0.65	0.030	0.030
SA210C	0.18 0.24	0.1	0.80 1.10	0.030	0.030
ASME SA213	SA213 T11	0.05 0.15	0.50 1.0	0.30 0.60	0.030	0.030	1.00 1.50	0.50 1.00
SA213 T12	0.05 0.15	0.50	0.30 0.61	0.030	0.030	0.80 1.25	0.44 0.65
SA213 T22	0.05 0.15	0.50	0.30 0.60	0.030	0.010	1.90 2.60	0.87 1.13
SA213 T23	0.04 0.10	0.50	0.10 0.60	0.030	0.030	1.90 2.60	0.05 0.30				0.030	1.45 1.75	B 0.0005 0.006	0.02 0.08	0.040
SA213 T91	0.08 0.12	0.20 0.50	0.30 0.60	0.020	0.010	8.00 9.50	0.85 1.05		0.40	0.18 0.25	0.015			0.06 0.10	0.03 0.07
SA213 T92	0.07 0.13	0.50	0.30 0.60	0.020	0.010	8.50 9.50	0.30 0.60		0.40	0.15 0.25	0.015	1.50 2.00	B 0.001 0.006	0.04 0.09	0.03 0.07
DIN 17175	ST45.8 /	0.21	0.10 0.35	0.40 1.20	0.040	0.040
15Mo3	0.12 0.20	0.10 0.35	0.40 0.80	0.035	0.035		0.25 0.35
13CrMo44	0.10 0.18	0.10 0.35	0.40 0.70	0.035	0.035	0.70 1.10	0.45 0.65
10CrMo910	0.08 0.15	0.50	0.30 0.70	0.025	0.020	2.00 2.50	0.90 1.10	0.30	0.30		0.015

Alloy management theory calculation:

(Outer diameter-wall thickness) * wall thickness * 0.02483 = weight per meter.

The material of the alloy tube is roughly : 16-50Mn, 27SiMn, 20-40Cr, 12-42CrMo

16Mn 12Cr1MoV T91 27SiMn 30CrMo 15CrMo 20G Cr9Mo 10CrMo910 15Mo3 15CrMoV 35CrMoV 45CrMo

Classification of alloy pipes:

Palladium alloy tube is used to separate hydrogen from impurities.

The principle of palladium tube purification of hydrogen is that when hydrogen to be purified is passed to one side of the palladium tube at 300-500 ° C, hydrogen is adsorbed on the wall of the palladium tube. Because the 4d electron layer of palladium lacks two electrons, It can form unstable chemical bonds with hydrogen (this reaction of palladium and hydrogen is reversible). Under the action of palladium, hydrogen is ionized into protons with a radius of 1.5 × 1015m, and the lattice constant of palladium is 3.88 × 10 10m (at 20 ° C), so it can pass through the palladium tube, under the action of palladium, the protons combine with the electrons again to form hydrogen molecules, and escape from the other side of the palladium tube. On the surface of the palladium tube, the undissociated gas is impermeable, so high purity hydrogen can be obtained by using the palladium tube. Although palladium has a unique permeability to hydrogen,

[1] To reduce the amount of hydrogen permeation in T22 alloy steel pipes, it is necessary to minimize the pickling of high-strength / high-hardness steel T22 alloy steel pipes because pickling can increase hydrogen embrittlement. When removing rust and scale, try to use sand blasting. If the T22 alloy steel pipe with Rockwell hardness equal to or greater than HRC 32 is pickled, you must ensure that the T22 alloy steel pipe is soaked in acid when the pickling process is formulated The maximum time is 10 minutes. The concentration of the acid solution should be reduced as much as possible, and the parts should be immersed in acid for less than 10 minutes. When removing oil, use chemical degreasing methods such as detergent or solvent degreasing to reduce the amount of hydrogen penetration. If electricity is used, Chemical degreasing, cathode first, anode first, high strength T22 alloy steel pipe is not allowed to use the cathode for degreasing; strictly control the dripping amount of methanol and propane during heat treatment; alkaline plating solution or high current efficiency The amount of liquid hydrogen permeation is small.
[2] Using a coating with low hydrogen diffusivity and low hydrogen solubility is generally believed that when plating Cr, Zn, Cd, Ni, Sn, Pb, hydrogen that penetrates into steel parts is easy to remain, while Cu, Mo, Al, The coatings of T22 alloy steel pipes such as Ag, Au, W have low hydrogen diffusion and low hydrogen solubility, and less hydrogen permeation. In the case of meeting the technical requirements of the product, coatings that do not cause hydrogen permeation, such as mechanical zinc plating or chromium-free zinc-aluminum coating, can be used without hydrogen embrittlement, high corrosion resistance, good adhesion, and Environmental protection.
[3] Remove stress before plating and remove hydrogen after plating to eliminate the hidden danger of hydrogen embrittlement. If the internal residual stress is large after quenching, welding and other processes, tempering should be performed before plating. Tempering can reduce the stress in the part. The number of traps, thereby mitigating the hidden dangers of hydrogen embrittlement.
[4] Control the thickness of the plating layer. As the plating layer covers the surface of the fastener, the plating layer acts as a hydrogen diffusion barrier to a certain extent, which will hinder the diffusion of hydrogen to the outside of the fastener. When the thickness of the coating exceeds 2.5 m, it is very difficult for hydrogen to diffuse out of the fastener. Therefore, the coating thickness of fasteners with a hardness of less than 32HRC can be required to be 12m; for high-strength bolts with a hardness of 32HRC, the coating thickness should be controlled at 8mmax. This requires that in product design, the risk of hydrogen embrittlement of high-strength bolts must be taken into account, and the plating type should be selected reasonably.

First: rust removal level, for epoxy commonly used in alloy pipes,

Classification of alloy pipes

(1)

Deviation level	Standardized outside diameter tolerance
D1	± 1.5% , minimum ± 0.75 mm
D2	± 1.0% . ± 0.50 mm
D3	± 0.75% ± 0.30 mm
D4	± 0.50% . ± 0.10 mm

Alloy tube is mainly used for heating surface tubes of low and medium pressure boilers (working pressure is generally not greater than 5.88Mpa and working temperature below 450 ° C); for high pressure boilers (working pressure is generally above 9.8Mpa and working temperature is 450 650) ) heating surface pipes, economizers, superheaters, reheaters, pipes for petrochemical industry, etc.

High-pressure alloy tube grades: 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8 / , 15Mo3, 13CrMo44, 10Cr

Alloy specification table

Unit: Kg / m
Wall thickness outer diameter	3	3.5	4	4.5	5	5.5	6
32	2.146	2.460	2.762	3.052	3.329	3.594	3.847
38	2.589	2.978	3.354	3.718	4.069	4.408	4.735
42	2.885	3.323	3.749	4.162	4.562	4.951	5.327
45	3.107	3.582	4.044	4.495	4.932	5.358	5.771
50	3.477	4.014	4.538	5.049	5.549	6.036	6.511
54	3.773	4.359	4.932	5.493	6.042	6.578	7.103
57	3.995	4.618	5.228	5.826	6.412	6.985	7.546
60	4.217	4.877	5.524	6.159	6.782	7.392	7.990
63.5	4.476	5.179	5.869	6.548	7.214	7.867	8.508
68	4.809	5.567	6.313	7.047	7.768	8.477	9.174
70	4.957	5.740	6.511	7.269	8.015	8.749	9.470
73	5.179	5.999	6.807	7.602	8.385	9.156	9.914
76	5.401	6.258	7.103	7.935	8.755	9.563	10.358
89	6.363	7.380	8.385	9.378	10.358	11.326	12.281
108	7.768	9.020	10.259	11.486	12.701	13.903	15.093
133	11.178	12.725	14.261	15.783	17.294	18.792
159	13.422	15.290	17.146	18.989	20.821	22.639
219	18.601	21.209	23.805	26.388	28.959	31.517
273	23.262	26.536	29.797	33.046	36.283	39.508
325	27.750	31.665	35.568	39.458	43.337	47.202
355	38.897	43.158	47.406	51.641
377	41.339	45.871	50.390	54.897
426	46.777	51.913	57.036	62.147
450
480
530
630
Unit: Kg / m
Wall thickness outer diameter	6.5	7	8	8.5	9	10	12
32	4.088
38	5.049
42	5.691
45	6.172
50	6.973	7.423	8.286	8.699
54	7.614	8.114	9.075	9.538
57	8.095	8.632	9.667	10.167
60	8.576	9.149	10.259	10.796
63.5	9.137	9.754	10.950	11.529
68	9.858	10.530	11.838	12.473
70	10.179	10.876	12.232	12.892	13.539	14.797	17.164
73	10.660	11.394	12.824	13.521	14.205	15.537	18.052
76	11.141	11.912	13.416	14.150	14.871	16.277	18.940
89	13.225	14.156	15.981	16.875	17.756	19.483	22.787
108	16.270	17.436	19.729	20.858	21.973	24.168	28.410
133	20.278	21.751	24.662	26.098	27.522	30.334	35.809
159	24.446	26.240	29.791	31.548	33.293	36.746	43.503
219	34.064	36.598	41.629	44.126	46.610	51.543	61.259
273	42.720	45.920	52.283	55.445	58.596	64.860	77.240
325	51.056	54.897	62.542	66.346	70.137	77.684	92.629
355	55.865	60.076	68.460	72.634	76.796	85.082	101.507
377	59.391	63.873	72.801	77.246	81.679	90.508	108.018
426	67.246	72.332	82.468	87.518	92.555	102.592	122.519
450	71.093	76.475	87.203	92.549	97.882	108.511	129.621
480	75.902	81.654	93.122	98.837	104.540	115.909	138.499
530	83.917	90.286	102.987	109.319	115.638	128.240	153.296
630	99.947	107.549	122.716	130.281	137.833	152.902	182

16Mn Specification Sheet

specification	Quantity	specification	Quantity	specification	Quantity	specification	Quantity	specification	Quantity	specification	Quantity
406 * 16	12	457 * 32	20	508 * 80	20	530 * 22	10	660 * 80	20	820 * 55	56
406 * 17	14	457 * 35	25	508 * 90	20	530 * 25	20	660 * 90	20	820 * 60	52
406 * 18	14	457 * 40	20	508 * 100	20	530 * 28	15	660 * 100	20	820 * 70	54
406 * 19	14	457 * 45	25	530 * 16	30	610 * 30	20	660 * 150	20	820 * 80	50
406 * 20	14	457 * 50	15	530 * 17	20	610 * 32	10	710 * 20	30	820 * 90	65
406 * 22	14	457 * 55	20	530 * 18	20	610 * 35	10	710 * 22	15	820 * 100	62
406 * 25	18	457 * 60	20	530 * 19	20	610 * 40	10	710 * 25	20	820 * 150	61
406 * 28	20	457 * 65	15	530 * 20	30	610 * 45	10	710 * 28	15	820 * 200	63
406 * 30	25	457 * 70	20	530 * 22	20	610 * 50	20	710 * 30	20	864 * 40	75
406 * 32	25	457 * 80	20	530 * 25	30	610 * 55	15	710 * 32	15	864 * 55	78
406 * 35	25	457 * 90	25	530 * 28	30	610 * 60	15	710 * 35	15	864 * 60	79
406 * 40	25	457 * 100	20	530 * 30	20	610 * 65	10	710 * 40	20	864 * 70	81
406 * 45	50	480 * 16	50	530 * 32	30	610 * 70	60	710 * 45	20	864 * 80	89
406 * 50	28	480 * 17	15	530 * 35	20	610 * 80	10	710 * 50	20	864 * 90	85
406 * 55	25	480 * 18	15	530 * 40	20	610 * 90	10	710 * 55	15	864 * 100	25
406 * 60	20	480 * 19	30	530 * 45	20	610 * 100	15	710 * 60	25	864 * 150	36
406 * 65	25	480 * 20	20	530 * 50	20	610 * 150	15	710 * 65	30	864 * 200	twenty three
406 * 70	20	480 * 22	20	530 * 55	25	630 * 18	15	710 * 70	60	900 * 60	68
406 * 80	25	480 * 25	20	530 * 60	25	630 * 19	15	710 * 80	30	900 * 70	twenty three
406 * 90	20	480 * 28	20	530 * 65	60	630 * 20	10	710 * 90	30	900 * 80	35
426 * 16	25	480 * 30	25	530 * 70	30	630 * 22	25	710 * 100	54	900 * 90	39
426 * 17	25	480 * 32	15	530 * 80	60	630 * 25	15	710 * 150	50	900 * 100	69
426 * 18	20	480 * 35	15	530 * 90	30	630 * 28	15	720 * 25	65	900 * 150	80

use

Alloy steel pipe is mainly used in power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters, and other high-pressure and high-temperature pipes and equipment. , Hot rolled (extruded, expanded) or cold rolled (drawn).

advantage

It can be 100% recycled, in line with the national strategy of environmental protection, energy saving and resource conservation. National policies encourage the expansion of the application field of high-pressure alloy pipes. At present, the proportion of alloy pipe consumption in China's total steel is only half of that in developed countries. The expansion of the field of alloy pipe provides a wider space for industry development. According to the research by the expert group of the Alloy Pipe Branch of the China Special Steel Association, the future annual demand for high-pressure alloy pipe long products in China will reach 10-12%.

Connections and differences with seamless pipes

Alloy pipe is defined according to the production materials (that is, materials), as the name implies, is made of alloy; seamless pipe is defined according to the production process (seamless seamless), which is different from seamless pipe is Slotted pipe, including straight seam welded pipe and spiral welded pipe.

standard

Alloy pipes have a hollow cross section and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water, machinery, and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe is lighter when the bending and torsional strength is the same. Alloy steel pipe is an economical cross-section steel, which is widely used to manufacture structural parts and mechanical parts, such as petroleum drill rods and automobile transmission Axles, bicycle frames, and steel scaffolding used in building construction. Manufacture of annular parts with alloy steel pipes can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing rings, jack sleeves, etc. Currently, steel pipes have been widely used for manufacturing. Alloy steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes. Alloy steel pipes can be divided into round pipes and special-shaped pipes according to the different cross-sectional area shapes. Since the circular area is the largest under the condition of equal perimeter, more fluid can be transported by the circular tube. In addition, when the cross section of the ring is subjected to internal or external radial pressure, the force is more uniform. Therefore, most steel pipes are round pipes.

Alloy pipes include large-diameter alloy pipes, thick-walled alloy pipes, high-pressure alloy pipes, alloy flanges, alloy elbows, P91 alloy pipes, and seamless steel pipes. In addition, special fertilizer pipes are also very common.