GOST R 50278-92. Of drill pipe with welded locks. Specifications
Buy drill pipe with welded locks, which are manufactured according to the technical requirements of GOST R50278−92, offers the company Electrovek-steel. The products are sold at producer prices. The supplier guarantees the prompt delivery of rolled metal to any address specified by the customer.
The provisions of GOST R50278−92 apply to seamless steel pipes with attached ends and welded to them locks, designed for the construction of oil and gas wells. Climatic conditions of use — from 1 to 11 in accordance with GOST 16350. Locks for welding should be made in accordance with GOST 27834.
Drill pipes with welded locks should be made with three types of planted ends:
PV — with internal landing;
PC — with combined landing;
Mon — with an external landing.
In accordance with the order, pipes of all types must be manufactured with locks having a rectangular or conical shoulder under the elevator, as well as with a right or left thread.
Pipes with welded locks must be manufactured in three groups of lengths according to the table below.
|Parameter name||Length group|
|Pipe length, m||5.9−6.3||8.0−8.6||11.9−12.5|
1. The length of the pipe is defined as the distance between the thrust shoulder of the pin and the stop face of the lock clutch.
2. Pipes with diameters of 60, 73 and 89 mm produce three groups of lengths, pipes with diameters of 102, 114, 127 and 140 mm — only the second and third groups.
Buy an assortment of drill pipes with welded locks at economically favorable prices from the manufacturer offers the company Elektrovek-steel. The supplier ensures the timely delivery of products to any point specified by the customer.
Pipes shall be manufactured in accordance with the requirements of this standard for technological regulations approved in accordance with the established procedure.
On the outer and inner surfaces of the pipes there should be no captivity, shells, sunsets, delaminations, cracks, sand pits and flaws. It is allowed to cut and clean these defects only along the axis of the pipe, provided that cutting and trimming do not lead to a wall thickness beyond the limit minus deviations.
Welding, caulking or sealing of defects are not allowed.
In places where the thickness of the wall can be measured directly, the depth of the defective places may exceed the marginal minus deviations, provided that the minimum wall thickness is maintained, defined as the difference between the nominal wall thickness of the pipe and the limiting minus deviation.
Allowed for some minor nicks, dents, risks, a thin layer of scale and other defects caused by the method of production, if they do not lead to a wall thickness beyond the limits of minus deviations.
The surface of the planted part of the pipe and the place of its transition to a part with wall thickness should not have sharp benches.
Pipes should be made of steels of strength group D, E, L, M and P.
The mass fraction of sulfur and phosphorus in steels should be:
Not more than 0.035% for each component — for pipes of strength groups D, E, L;
Not more than 0.020% for each component — for pipes of strength groups M and P.
Pipes of all strength groups should be subjected to heat treatment along the entire length after the ends are planted. The mechanical properties of the pipe metal after heat treatment should be as given in the table.
|Indicator name||Norm of mechanical properties of steel with strength group|
|Temporary resistance, MPa (kgf / mm 2), not less than||655
|Yield strength, MPa (kgf / mm 2):|
|Not less than||379
|Relative elongation,%, not less than||16||14||14||12||12||11.5||10.5|
|Relative contraction after fracture,%, not less than||50||50||50||45||45||40||40|
|Impact strength KCV J / cm (kg / cm 2), not less than||690
|Note. — Strength groups T and Y are introduced into the standard as promising. It is allowed to make pipes of groups T and U according to normative and technical documentation.|
The weld zone after removal of the bead must be heat treated. The heat treatment zone (quenching, normalization) must overlap the heat-affected zone of the welding, the tempering zone must not extend beyond the cylindrical part of the planted pipe ends and nipples and lock couplings.
The outer and inner surfaces of the welded joint must be machined along the entire length of the cylindrical part of the ejected pipe ends and nipples and lock couplings to the dimensions given in Tables 1 and 2. When machining the cuts in the body of the pipe, the inner and outer surfaces are not allowed. On the inner surface of the welded joint, a trail with a large step from the cutting tool outlet is allowed, not exceeding the upper tolerance of the internal diameter of the welded joint.
The roughness of the treated external surfaces should not be more than 80 microns, the internal surfaces should not exceed 130 microns in accordance with GOST 2789.
The welded joint must be subjected to a bend test.
The mutual displacement of the outer surface of the pipe and the outer surface of the locking parts must not exceed 1.2 mm.
Marking must comply with GOST 10692 with additions. On the outer surface of the cylindrical part of the landing of each pipe, the nipple of the lock should have a clear marking with stamps not less than 6 — 3 in accordance with GOST 26.008. Marking is applied by impact or knurling in the following sequence:
The manufacturer’s trademark, nominal diameter, mm;
Conventional wall thickness (integer), mm;
Month and year of issue (last two digits);
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