With our excellent management, powerful technical capability and strict high-quality regulate technique, we continue on to provide our consumers with dependable excellent, reasonable rates and outstanding services. We goal at becoming certainly one of your most trustworthy partners and earning your satisfaction for Alloy Seamless Steel Pipe for High Pressure Boiler, Welcome worldwide customers to contact us for business and long-term cooperation. We will be your reliable partner and supplier. Our company is an international supplier on this kind of merchandise. We provide an amazing selection of high-quality solutions. Our goal is to delight you with our distinctive collection of mindful items while providing value and excellent service. Our mission is simple: To offer the best products and service to our customers at the lowest prices possible.
Power plant boiler main steam piping materials commonly used 15 crmog15 crmog is 15 crmo steel seamless steel pipe, is a kind of low alloy structural steel, mainly is suitable for the calculation of wall temperature is not more than 550 ℃ high pressure and high pressure power station boiler main steam pipe. The steel grade of national standard GB5310-2017, in the standard delivery of 15 crmog steel heat treatment state provisions in detail.
Because of the addition of alloy elements, and the calculation of the steel carbon equivalent CE 0.43 ~ 0.63, shows 15 crmog steel weldability significantly worse in 20 g steel. Appear more easily weld cold crack, reheating crack and temper brittleness, etc. In general, the same conditions of 15 crmog strength, hardness and other mechanical properties are better than that of 20 g, in addition, the addition of Cr element to improve oxidation resistance of the material, the addition of Mo element to improve the heat intensity of material, therefore, 15 crmog steel in power plant boiler main steam piping used under the condition of high temperature, on the basis of mechanics performance requirements, at the same time have enough strong oxidation resistance and thermal resistance. As a kind of heat resistant steel, pearl size 15 crmog phase microstructure of ferrite and pearlite, long-term under high temperature conditions used will produce pearlite spheroidization. According to the DL/T787-2001 coal-fired power plants with 15 crmo pearlitic steel spheroidizing rating standards, according to the characters of pearlite spheroidization organization spheroidizing level can be divided into levels 1 to 5, with the increase of level of spheroidizing, 15 crmog mechanical properties and thermal properties of the steel decreases.
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. | |||