Yosun (Tianjin) Piping Engineering Co., Ltd. is one of the most credible manufacturers and suppliers of low alloy steel tubes in China. Please feel free to wholesale customized low alloy steel tubes at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.
Process
1.The steel may be made by any process.
2.If a specific type of melting is required by the purchaser,it shall be as stated on the pruchase order.
3.The primary melting may incorporate separate degassing or refining and may be followed by secondary melting,such as eletroslag remelting or vacuum-arc remelting.
4.Steel may be cast in ingots or may be strand cast.When steel of different grades is sequentially strand cast,identification of the resultant transition material is required.The producer shall remove the transition material by an established procedure that positively separates the grades.
Tensil Properties
1.The material shall conform to the reqirements as to tensile properties prescribed in the individual specification.
2.The yield strength corresponding to a permanent offset of 0.2% of the gage length or to a total extension of 0.5% of the gage length under load shall be determined.
3.If the percentage of elongation of any test specimen is less than that specified and any part of the fracture is more than 3/4 in.[19.0 mm] from the center of gage length,as indicated by scribe marks on the specimen before testing,a retest shall be allowed.
Product key parameters
[Permissible Varoations in Weight Per Unit LengthA]
| Method of Manufacture | Permissible Variation in Weight per Unit Length,% | |
| over | under | |
|
seamless,hot-finished seamless,cold-finished |
16 | 0 |
| 1 1/2 in.[38.1mm] and under OD | 12 | 0 |
| over 1 1/2 in.[38.1 mm] OD | 13 |
0 |
| Welded | 10 | 0 |
| A These permissible variations in weight apply to lots of 50 tubes or more in sizes 4 in.[101.6 mm] and under in outside diameter,and to lots of 20 tubes or more in sizes over 4 in.[101.6 mm] in outside diameter. | ||
[Permissible Variations in LengthA]
| Method of Manufacture | Outside Diameter,in.[mm] | Cut Length,in.[mm] | |
| Over | Under | ||
| Seamless,hot-finished | all sizes | 3/16[5] | 0[0] |
| Seamless,cold-finished | under 2 [50.8] | 1/8 [3] | 0[0] |
| Finished | 2 [50.8] and over | 3/16[5] | 0[0] |
| Welded |
under 2 [50.8] |
1/8[3] | 0[0] |
| - | 2 [50.8] and over | 3/16[5] | 0[0] |
| A These permissible variations in length apply to tubes befor bending.Thet apply to cut lengths up to and including 24 ft[7.3 m].For length greater than 24 ft[7.3m],the above over-tolerances shall be increased by 1/8 in.[3 mm] for each 10ft [3 m]or fraction thereof over 24 ft or 1/2 in.[13 mm],whichever is the lesser. | |||
[Flaring Test Requirements]
| Ratio Of Inside Diameter To Outside DiameterA | Minimum Expansion Of Inside Diameter,% | |
| Carbon Steesl | Low Alloy Steels | |
| 0.9 | 21 | 15 |
| 0.8 | 22 | 17 |
| 0.7 | 25 | 19 |
| 0.6 | 30 | 23 |
| 0.5 | 39 | 28 |
| 0.4 | 51 | 38 |
| 0.3 | 68 | 50 |
| A In determining the ratio of inside diameter to specified outside diameter,the inside diameter shall be defined as the actual mean inside diameter of the material tested. | ||
General Parameters of the Product
| OD | 10.3mm-812mm |
| WT | SCH STD-SCH XXS |
| Outside | Black,bare Pipe ,Galvanized |
| Ends | BE,PE |
| Length | 6m,max 11.8 Or Customized |
Retreatment
If the indivaidual tubes or the tubes selected to represent any gruop or lot fail to conform to the test requirements,the individual tubes or the gruo or lot represented may be retreated and resubmitted for test.Not more than two reheat treatments shall be permitted.
Test Specimens
1.Test specimens shall be taken from the ends of finished tubes prior to upsentting,swaging,expanding,or other forming operations,or being cut to length.They shall be smooth on the ends and free of burrs and flaws.
2.If any test specimen shows flaws or defective machining,it may be discarden and another soecimen substityted.
FAQ
Q: For pipe materials with a wall thickness of 5.1mm or more, what kind of hardness measurement method should be adopted for the layer beams?
A: Either the Brinell or Rockwell hardness test shall be used.
Q: Under what conditions can it be determined that the outer surface is qualified?
A: N: Alswralaces shalbe free of scale,dirt.grease,paint.or other foreign material that ould mnterere withinterprelaion oftestresuis.The methods used for deaming and prepaning the suraces forexamination shall not be detrimental to the base metal or the surface finish.
Q: How to Conduct an Air Pressure Test?
A: When this testis employed.each ubewith intenal swrace cean and dnysha be intermay pressuized to 150 psi[1000 kPal minimum with dean and dy ompresed air while being submergedindlear waler.The tube shal be weliolhted,preferably by underwaterilminaton.Anyevidence ofair leakae ofthe pneumalic coupnas sha be coreced pror to tesinansecion shal be made of thienre extemalsuace ofthe tube aer holding the pesure fornotless than 5s aterthe surace of the waierhas become calmfanytube shows leakage duing the air undenvaier estitshal bereiected.Any leaking areas may be cut out and the tube retested.
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