Um dos principais fabricantes de tubos de aço de caldeira sem costura na China, oferece alta qualidade tubos de trocador de calor de aço, tubo de caldeira de carbono sem costura, tubo de caldeira de aço de liga
Os tubos de aço de caldeira sem costura são produzidos pela Cold Drawn Seamless Processing,
com grau de aço de aço de baixo carbono, aço de carbono médio, aço de liga etc.
Padrões Técnicos como
ASTM A179, ASTM A192, ASTM A210, ASTM A213, ASTM A334, ASTM A335 etc.
DIN17175, EN10216-2, GB / T 5310, BS3059, etc.
Grau de aço:
Grau de Aço Carbono:
ST35.8, ST37.0, ST44, ST52;
E155, E195, E215, E235, E275, E355;
195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2;
SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;
Tubo de aço carbono: SA178, A179, A192, A210, SA213, SA214, etc.
Liga de aço grau:
T2, T5, T9, T11, T12, T17, T21, T22, T91, T92, 15Mo3, 16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn, 12Cr1MoVG;
Nome do produto : TORICH GB / T20409 20G 20MnG 25MnG SA210 SA213 caldeira de alta pressão multi-rifled tubos de aço sem costura
Padrão : GB / T20409
OD: 3-420 mm
WT: 0,5 a 50 mm
Comprimento : 8-12m ou de acordo com a aplicação e a produção reais dos clientes.
Aplicação : Caldeira de alta pressão
Classe de aço : 20G 20MnG 25MnG SA210 SA213
Tecnologia : laminados a quente, laminados a frio, estirado a frio
Característica:
Boa concentricidade
Boa qualidade de superfície
Boa tolerância a OD e ID
Alta precisão
Qualidade estável
Rugosidade Suave
GARANTIA DE QUALIDADE DA TORICH
Tabela 6 Propriedades mecânicas longitudinais dos tubos de parafuso internos à temperatura ambiente
|
Number
|
Grade
|
tensile strength
RM
MPa(N/mm2 )
|
Lower yield strength
ReL /MPa((N/mm2)
|
Elongation
A/%
|
Impact energy
AKV /J
|
|
Not less than
|
|
1
|
20G
|
410~550
|
245
|
24
|
35
|
|
2
|
20MnG
|
≥415
|
240
|
22
|
35
|
|
3
|
25MnG
|
≥485
|
275
|
20
|
35
|
|
4
|
12CrMoG
|
410~560
|
205
|
21
|
35
|
|
5
|
15CrMoG
|
440~640
|
235
|
21
|
35
|
Tabela4 O grau e composição química do aço
|
Number
|
Brand
|
chemical
composition(mass fraction)/ %
|
|
C
|
Mn
|
Si
|
Cr
|
Mo
|
S
|
P
|
|
1
|
20G
|
0.17~0.23
|
0.35~0.65
|
0.17~0.37
|
--
|
--
|
≤0.020
|
≤0.025
|
|
2
|
20MnG
|
0.17~0.23
|
0.70~1.00
|
0.17~0.37
|
--
|
--
|
≤0.020
|
≤0.025
|
|
3
|
25MnG
|
0.22~0.29
|
0.7~1.00
|
0.17~0.37
|
--
|
--
|
≤0.020
|
≤0.025
|
|
4
|
12CrMoG
|
0.08~0.15
|
0.40~0.70
|
0.17~0.37
|
0.40~0.70
|
0.40~0.55
|
≤0.020
|
≤0.025
|
|
5
|
15CrMoG
|
0.12~0.18
|
0.40~0.70
|
0.17~0.37
|
0.80~1.10
|
0.40~0.55
|
≤0.020
|
≤0.025
|
|
Note1:Residual element
content of 20G.20MnG.25MnG
should satisfy: Cu≤0.20%.Cr≤0.25%.Ni≤0.25%.V≤0.08%.Mo≤0.15%;The remaining elements of other
brands should satisfy: Cu≤0.20%.Ni≤0.30%.
Note2:The acid soluble
aluminum in 20G steel should not be more than 0.010%.
Note3:The nitrogen content
of the steel produced by the oxygen converter plus the refining of the
furnace should not be more than 0.008%.
|
O tamanho dos tubos de parafuso internos e o desvio permitido dos parâmetros de rosca
|
Code
|
Project
|
[A" teeth types
allowable deviation
|
[B" teeth types
allowable deviation
|
|
A
|
O.D≤38.1mm
38.1mm＜O.D＜50.8mm
50.8mm≤O.D≤63.5mm
O.D≥63.5mm
|
±0.15mm
±0.20mm
±0.25mm
±0.30mm
|
--
|
|
B
|
O.D≤38.1mm
38.1mm＜O.D＜50.8mm
50.8mm≤O.D≤63.5mm
O.D≥63.5mm
|
--
|
±0.15mm
±0.20mm
±0.25mm
±0.30mm
|
|
C
|
I.D of the root of the screw
Thread:
O.D-(1.11×Minimum W.T×2)
O.D≤38.1mm
38.1mm＜O.D＜50.8mm
50.8mm≤O.D≤63.5mm
O.D≥63.5mm
|
±0.15mm
±0.20mm
±0.25mm
±0.30mm
|
±0.15mm
±0.20mm
±0.25mm
±0.30mm
|
|
E
|
Minimum I.D
|
Negative deviation to
zero
|
Negative deviation to
zero
|
|
F
|
Minimum W.T
|
+22%
0
|
+22%
0
|
|
G
|
Thread tips
|
--
|
--
|
|
I
|
Thread top width
|
--
|
--
|
|
Ja
|
Height of thread:
O.D≤38.1mm
38.1mm＜O.D＜50.8mm
50.8mm≤O.D≤63.5mm
O.D≥63.5mm
|
±0.3mm
|
±0.18mm
±0.20mm
±0.23mm
±0.28mm
|
|
K
|
Side Angle of thread.
|
±15°
|
±15°
|
|
O
|
radius of rounded corner
at the root of thread
|
--
|
--
|
|
M
|
Thread pitch
|
±3.2mm
|
±3.2mm
|
|
N
|
Thread lead
|
±3.2mm×thread tips
|
±3.2mm×thread tips
|
|
Qb
|
Helix angle
|
Rating
|
Rating
|
|
T
|
Thread top width (axial)
|
±1.3mm
|
±1.3mm
|
|
U
|
Thread top (axial)
groove width
|
--
|
--
|
|
a. For the B type, the maximum deviation of any thread height can
exceed the allowable deviation specified in the table, but it should not
exceed the allowable deviation of 0.08mm, and the average height of all
threads should be in line with the given deviation range.
b. The rating is based on the axis of the pipe.
|
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