Our target should be to consolidate and enhance the top quality and service of current goods, in the meantime frequently create new products to satisfy diverse customers' calls for for High-Temperature Service SMLS Steel Pipe. To improved expand sector, we sincerely invite ambitious individuals and corporations to join as an agent. With the aim of "compete with good quality and develop with creativity" and the service principle of "take customers' demand as orientation", we are going to earnestly present qualified products and good service for domestic and international customers.
P235GH is Germany high temperature structural steel, code number is 1.0345, the steel grades of EN10028, is carbon steel container plate. Generally uses electric arc furnace and oxygen top-blown converter smelting, steel with high requirement adpot refining outside the furnace, electroslag remelting or vacuum processing, vacuum induction furnace smelting or double vacuum smelting, suitable heat treatment. Alloy element content is quite high. Has good plasticity and toughness, cold bending property and welding performance, suitable for manufacturing nuclear steel containment vessel, pressure vessel, equipment components. China steel grade Q245R can be used to replace. Compared with ordinary steel has higher strength and toughness, cold bending property and welding performance, physical properties, chemical properties, biocompatibility and process performance.
Mechanical properties, tensile strength 350-480 MPa; Yield strength ≥215 MPa; Elongation ≥ 25%; Impact absorption ≥47J; Brinell hardness ≤ 105-140 HB100/3000,
Chemical (mass fraction, %) : C≤0.16; Si≤0.35; Mn 0.60~1.20; P≤0.025; S≤0.010; Cr≤0.30;Ni≤0.30; Cu≤0.30; Mo≤0.08; V≤0.02; Nb≤0.02; N≤0.012; Al≤0.020; Ti≤0.03.
Heat treatment: heat-treatment temperature 1100-850 ℃; Annealing temperature is 890 ~ 950 ℃; Normalizing temperature 520-580 ℃.
It is mainly used to make high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes for high pressure and above steam boiler pipes.
Mainly used for high pressure and high temperature service of boiler(Superheater tube, reheater tube, air guide tube, main steam tube for high and ultra high pressure boilers). Under the action of high temperature flue gas and water vapor, the tube will oxidize and corrode. It is required that the steel pipe has high durability, high resistance to oxidation and corrosion, and good structural stability.
Grade of high-quality carbon structural steel: 20g、20mng、25mng
Grade of alloy structural steel: 15mog、20mog、12crmog、15crmog、12cr2mog、12crmovg、12cr3movsitib, etc
Grade of rust-resistant heat-resistant steel: 1cr18ni9 1cr18ni11nb
| Grade |
Quality Class |
Chemical Property |
||||||||||||||
|
C |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
Cr |
Ni |
Cu |
Nd |
Mo |
B |
Als" |
||
|
不大于 |
不小于 |
|||||||||||||||
| Q345 | A |
0.20 |
0.50 |
1.70 |
0.035 | 0.035 |
0.30 |
0.50 |
0.20 |
0.012 |
0.10 |
— | — | |||
| B | 0.035 | 0.035 | ||||||||||||||
| C | 0.030 | 0.030 |
0.07 |
0.15 |
0.20 |
0.015 |
||||||||||
| D |
0.18 |
0.030 | 0.025 | |||||||||||||
| E | 0.025 | 0.020 | ||||||||||||||
| Q390 | A |
0.20 |
0.50 |
1.70 |
0.035 | 0.035 |
0.07 |
0.20 |
0.20 |
0.3。 |
0.50 |
0.20 |
0.015 |
0.10 |
— | — |
| B | 0.035 | 0.035 | ||||||||||||||
| C | 0.030 | 0.030 |
0,015 |
|||||||||||||
| D | 0.030 | 0.025 | ||||||||||||||
| E | 0.025 | 0.020 | ||||||||||||||
| Q42O | A |
0.20 |
0.50 |
1.70 |
0.035 | 0.035 |
0.07 |
0.2。 |
0.20 |
0.30 |
0.80 |
0.20 |
0.015 |
0.20 |
— |
— |
| B | 0.035 | 0.035 | ||||||||||||||
| C | 0.030 | 0.030 |
0.015 |
|||||||||||||
| D | 0.030 | 0.025 | ||||||||||||||
| E | 0.025 | 0.020 | ||||||||||||||
| Q46O | C |
0.20 |
0.60 |
1.80 |
0.030 | 0.030 |
0.11 |
0.20 |
0.20 |
0.30 |
0.80 |
0.20 |
0.015 |
0.20 |
0.005 |
0.015 |
| D | 0.030 | 0.025 | ||||||||||||||
| E | 0.025 | 0.020 | ||||||||||||||
| Q500 | C |
0.18 |
0.60 |
1.80 |
0.025 | 0.020 |
0.11 |
0.20 |
0.20 |
0.60 |
0.80 |
0.20 |
0.015 |
0.20 |
0.005 |
0.015 |
| D | 0.025 | 0.015 | ||||||||||||||
| E | 0.020 | 0.010 | ||||||||||||||
| Q550 | C |
0.18 |
0.60 |
2.00 |
0.025 | 0,020 | 0.11 |
0.20 |
0.20 |
0.80 |
0.80 |
0.20 |
0.015 |
0.30 |
0.005 |
0.015 |
| D | 0.025 | 0,015 | ||||||||||||||
| E | 0.020 | 0.010 | ||||||||||||||
| Q62O | C |
0.18 |
0.60 |
2.00 |
0.025 | 0.020 |
0.11 |
0.20 |
0.20 |
1.00 |
0.80 |
0.20 |
0.015 |
0.30 |
0.005 |
0.015 |
| D | 0.025 | 0.015 | ||||||||||||||
| E | 0.020 | 0.010 | ||||||||||||||
| Except for Q345A and Q345B grades, the steel should contain at least one of the refined grain elements Al, Nb, V, and Ti. According to the needs, the supplier can add one or more refined grain elements, the maximum value Should meet the requirements in the table. When combined, Nb + V + Ti <0.22% °For Q345, Q390, Q420 and Q46O grades, Mo + Cr <0.30% oWhen each grade of Cr and Ni is used as the residual element, the content of Cr and Ni should not be more than 0.30%; when it needs to be added, its content should meet the requirements in the table or be determined by the supplier and the buyer through consultation.J If the supplier can guarantee that the nitrogen content meets the requirements in the table, the nitrogen content analysis may not be performed. If Al, Nb, V, Ti and other alloy elements with nitrogen fixation are added to the steel, the nitrogen content is not limited. The nitrogen fixation content should be specified in the quality certificate.
'When using all aluminum, the total aluminum content AIt ^ 0.020% B |
||||||||||||||||
|
No |
Grade |
Mechanical Property |
||||
|
|
|
Tensile |
Yield |
Extend |
Impect (J) |
Handness |
|
1 |
20G |
410- |
≥ |
24/22% |
40/27 |
— |
|
2 |
20MnG |
415- |
≥ |
22/20% |
40/27 |
— |
|
3 |
25MnG |
485- |
≥ |
20/18% |
40/27 |
— |
|
4 |
15MoG |
450- |
≥ |
22/20% |
40/27 |
— |
|
6 |
12CrMoG |
410- |
≥ |
21/19% |
40/27 |
— |
|
7 |
15CrMoG |
440- |
≥ |
21/19% |
40/27 |
— |
|
8 |
12Cr2MoG |
450- |
≥ |
22/20% |
40/27 |
— |
|
9 |
12Cr1MoVG |
470- |
≥ |
21/19% |
40/27 |
— |
|
10 |
12Cr2MoWVTiB |
540- |
≥ |
18/-% |
40/- |
— |
|
11 |
10Cr9Mo1VNbN |
≥ |
≥ |
20/16% |
40/27 |
≤ |
|
12 |
10Cr9MoW2VNbBN |
≥ |
≥ |
20/16% |
40/27 |
≤ |
Wall Thickness and Outter Diameter:
If there is no special requirements, pipe gonna be delivery as norminal outter diameter and norminal wall thickness. As follow sheet
|
Classification designation |
Method of manufacture |
Size of pipe |
Tolerance |
|||
|
Normal grade |
High grade |
|||||
|
W H |
Hot Rolled（extrude） pipe |
Norminal outter Diameter （D） |
<57 |
士 0.40 |
±0,30 |
|
|
57 〜325 |
SW35 |
±0.75%D |
±0.5%D |
|||
|
S>35 |
±1%D |
±0.75%D |
||||
|
>325 〜6。。 |
+ 1%D or + 5.Take lesser one一2 |
|||||
|
>600 |
+ 1%D or + 7,Take lesser one一2 |
|||||
|
Norminal Wall Thickness （S） |
<4.0 |
±|・丨） |
±0.35 |
|||
|
>4.0-20 |
+ 12.5%S |
±10%S |
||||
|
>20 |
DV219 |
±10%S |
±7.5%S |
|||
|
心219 |
+ 12.5%S -10%S |
土 10%S |
||||
|
W-H |
Thermal expansion pipe |
Norminal outter Diameter
(D) |
all |
±1%D |
±0.75%。 |
| Norminal Wall Thickness
(S) |
all |
+ 20%S -10%S |
+ 15%S -io%s |
||
|
W-C |
Cold drawn(rolled) Ppipe |
Norminal outter Diameter
(D) |
<25.4 |
±'L1j |
— |
|
>25.4 〜4() |
±0.20 |
||||
|
>40 〜50 |
|:0.25 |
— |
|||
|
>50 〜60 |
±0.30 |
||||
|
>60 |
±0.5%D |
||||
|
Norminal Wall Thickness (S) |
<3.0 |
±0.3 |
±0.2 |
||
|
>3.0 |
S |
±7.5%S |
Length:
The usual length of steel pipes is 4 000 mm ~ 12 000 mm. After consultation between the supplier and the buyer, and fill in the contract, it can be delivered steel pipes with a length greater than 12 000 mm or shorter than I 000 mm but not shorter than 3 000 mm; short length The number of steel pipes less than 4,000 mm but not less than 3,000 mm shall not exceed 5% of the total number of steel pipes delivered
Delivery weight：
When the steel pipe is delivered according to the nominal outer diameter and nominal wall thickness or the nominal inner diameter and nominal wall thickness, the steel pipe is delivered according to the actual weight. It can also be delivered according to the theoretical weight.
When the steel pipe is delivered according to the nominal outer diameter and minimum wall thickness, the steel pipe is delivered according to the actual weight; the supply and demand parties negotiate. And it is indicated in the contract. The steel pipe can also be delivered according to the theoretical weight.
Weight tolerance：
According to the requirements of the purchaser, after consultation between the supplier and the purchaser, and in the contract, the deviation between the actual weight and the theoretical weight of the delivery steel pipe shall meet the following requirements:
a) Single steel pipe: ± 10%;
b) Each batch of steel pipes with a minimum size of 10 t: ± 7.5%.
Hydraustatic Test:
The steel pipe should be tested hydraulically one by one. The maximum test pressure is 20 MPa. Under the test pressure, the stabilization time should be not less than 10 s, and the steel pipe should not leak.
After the user agrees, the hydraulic test can be replaced by eddy current testing or magnetic flux leakage testing.
Nondestructive Test：
Pipes that require more inspection should be ultrasonically inspected one by one. After the negotiation requires the consent of the party and is specified in the contract, other non-destructive testing can be added.
Flattening Test：
Tubes with an outer diameter greater than 22 mm shall be subjected to a flattening test. No visible delamination, white spots, or impurities should occur during the entire experiment.
Flaring Test:
According to the requirements of the purchaser and stated in the contract, the steel pipe with outer diameter ≤76mm and wall thickness ≤8mm can be done flaring test . The experiment was performed at room temperature with a taper of 60 °. After the flaring, the flaring rate of the outer diameter should meet the requirements of the following table, and the test material must not show cracks or rips
|
Steel Type
|
Outter diameter flaring rate of steel pipe/% |
||
|
Inner Diameter/Outter Diameter |
|||
|
<0.6 |
>0.6 〜0.8 |
>0.8 |
|
|
High-quality carbon structural steel |
10 |
12 |
17 |
|
Structural alloy steel |
8 |
10 |
15 |
| •The inner diameter is calculated for the sample. | |||