Refrigerators are now a must-have for modern families. According to the category of refrigerators in the market, it can be divided into single-door refrigerators, double-door refrigerators, three-door refrigerators, door-to-door refrigerators, and multi-door refrigerators.
â– Single-door refrigerator: It refers to the refrigerator and the freezer compartment are combined in a refrigerator with only one door. The cooling method is based on the low temperature of the evaporator at the top of the box, so that the air inside the box naturally convects to transfer heat. It is mainly based on refrigeration and preservation, and has the advantages of simple structure, convenient use, low power consumption and low price.
â– Double-door refrigerator: It is a relatively traditional refrigerator. The refrigerator compartment and the freezer compartment are separated, usually the upper half of the refrigerator compartment and the lower half of the freezer compartment. It can meet the food storage needs of ordinary families in their daily lives. At present, the double-door refrigerator in the refrigerator market is gradually being replaced by a three-door refrigerator.
â– Three-door refrigerator: On the basis of the upper and lower double-door refrigerators, a fruit and vegetable room is added below, and after opening the door separately, it becomes a three-door refrigerator. The greenhouse can adjust the temperature of the greenhouse according to the needs of food storage. The three-door refrigerator is one of the current mainstream refrigerator types. The volume of the three-door refrigerator is relatively large, and it is more than 200L.
■Four-door refrigerator: On the basis of the three-door refrigerator, an independent, light-free freezer that can store fresh fish at a temperature of 0-1 °C is added between the refrigerator and the fruit and vegetable room. The four-door refrigerator has four temperature zones for freezing, refrigerating, fresh-keeping and fruit and vegetable storage.
â– Multi-door refrigerator: A popular trend in refrigerators this year, which divides the refrigerating and freezing areas into multiple temperatures of multiple door bodies, which is convenient for storing various foods.
Reporter Chen Wei / finishing
Standard of implementation: Chinese GB/T8163, GB/T8162, ASTM A106 GrB, ASTM A192
Application: used in conveying water, oil, gas and other fluids, and in structural building
Major grade grades: Grade10, 20 (negotiated, can also supply other special grade of steel tube. Accept the special requirements of the customer orders, such as the implementation of Q/320204AAAE02-2006 standard enterprise standard mechanical piping)
Chemical composition and mechanical properties of Seamless Steel Pipe:
|
Standard |
Steel grade |
Chemical constituents (%) |
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|
C |
Mn |
Si |
Cr |
Ni |
Cu |
P.S |
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|
GB/T8163 |
10 |
0.07~0.13 |
0.35~0.65 |
0.17~0.37 |
≤ 0.15 |
≤ 0.30 |
≤ 0.25 |
≤ 0.030 |
|
20 |
0.17~0.23 |
0.35~0.65 |
0.17~0.37 |
≤ 0.25 |
≤ 0.25 |
≤ 0.25 |
≤ 0.030 |
|
|
Q345 |
0.12~0.20 |
1.20~1.60 |
0.20~0.55 |
|
|
|
≤ 0.030 |
|
|
Mechanical properties |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation(%) |
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|
10 |
335~475 |
≥ 205 |
≥ 24 |
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|
20 |
410~550 |
≥ 245 |
≥ 20 |
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|
Q345 |
490~665 |
≥ 325 |
≥ 21 |
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Dimensional tolerance of Seamless Steel Pipe:
|
Type of steel tube |
Steel tube size mm |
Deviation |
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|
Ordinary grade |
Senior |
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|
Hot rolling (extrusion, expansion) tube |
Outside diameterD |
All |
+1%(Minimum+0.50) |
- |
|
Wall thicknessS |
All |
+15%(Minimum+0.45) -12.5%(Minimum-0.40) |
- |
|
|
Cold drawing (rolling) tube |
Outside diameterD |
6~10 |
+0.20 |
+0.15 |
|
>10~30 |
+0.40 |
+0.20 |
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|
>30~50 |
+0.45 |
+0.30 |
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|
>50 |
+1% |
+0.8% |
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|
Wall thicknessS |
≤1 |
+0.15 |
+0.12 |
|
|
>1~3 |
+15% -10% |
+12.5% -10% |
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|
>3 |
+12.5% -10% |
+10% |
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|
Note: the outer diameter is not less than 351mm of the thermal expansion tube, the wall thickness allows the deviation of +18% |
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Seamless Steel Pipe
Hot Rolled Seamless Steel Pipe,Hot-Expanded Seamless Steel Tube,Cold-Drawn Seamless Steel Tube,Carbon Steel Seamless Pipe
Cangzhou Fixed Star Steel Co.,Ltd , http://www.fixedstarpipe.com