GOST 631-75. Pipes drill with landed ends and couplings to them. Technical specifications

You are interested in GOST 631−75 «Drilling pipes with cut ends and couplings to them» from the supplier Avek Glob? We guarantee high quality products and a large selection of rolled metal products with worldwide delivery.

Application area

This standard applies to seamless steel pipes with attached ends and couplings to them, as well as pipes with planted ends and conical stabilizing belts used for drilling wells.

Assortment

Drill pipes should be manufactured:
type 1 — with inwardly spaced ends and couplings to them;
type 2 — with outward-planted ends and couplings to them;
type 3 — with inwardly spaced ends and conical stabilizing bands;
type 4 — with outward-planted ends and conical stabilizing bands.
Pipes types 1, 2 must be manufactured with right and left thread. Pipes types 3, 4 should be made with a right-hand thread, and according to the manufacturer’s agreement with the consumer — with the left. Thread direction is indicated in the order.
Pipes of all types must be manufactured in length:
6; 8 and 11.5 m — with a nominal diameter of 60 to 102 mm;
11.5 — with a nominal diameter of 114 to 168 mm.
Up to 25% of pipes with a length of 8 m and up to 8% of a length of 6 m are allowed in the lot.
With the consent of the consumer and in accordance with the specialization of pipe mills, pipes of 114 mm in diameter and 6 and 8 m long are allowed.
Limit deviations in size and weight of pipes and couplings should not exceed:
a) for the outside diameter of the pipe:
± 1% — with the usual accuracy of the manufacture of pipes types 1−4,
± 0.75% — with increased accuracy in the manufacture of pipes of types 1 and 2.
It is allowed to increase the outer diameter of pipes of type 2 to 1 mm for a length of not more than 100 mm behind the outside of the pipe and up to 4 mm in length up to 150 mm for pipes of type 4;
b) for the outer diameter of the coupling for pipes of types 1 and 2 — ± 1%;
c) for wall thickness:
— 12,5% — for pipes of usual accuracy of types 1−4,
— 10% — for pipes of increased accuracy types 1 and 2.
The deviations are limited by the mass of the pipes;
d) by the bore diameter of the coupling for pipes of types 1 and 2 — +1 mm;
e) on the smallest internal diameter of the planted part of pipes of types 1 and 3 with internal disembarkation — ± 1,5 mm;
e) along the length of pipes of types 1−4:
+0.6 m — for pipes with a length of 6 and 8 m,
+0.9 m — for pipes with a length of 11.5 mm;
g) along the length of the coupling for pipes of types 1 and 2 — ± 3 mm;
h) by weight of one pipe:
+ 9% — the usual accuracy of manufacturing types 1−4,
+ 6.5% — increased accuracy of manufacturing types 1 and 2.
Supplier — AvekGlob Company — offers at a reasonable price from the manufacturer a diverse range of joints for drill pipes, the threads on which meet all the technical requirements of GOST 631−75. The supplier guarantees the timely delivery of products to any address specified by the consumer.

Technical requirements

On the surface of pipes and couplings (outer and inner) there should be no captivity, shells, sunsets, delaminations, cracks and sand pits.
It is allowed to cut and clean these defects only along the axis of the pipe, provided that cutting and mopping do not remove the wall thickness for the maximum minus deviations. Welding, caulking or sealing of defects is not allowed.
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. On the inner surface of the transitional part of the outwardly drilled pipe ends of type 4 of all diameters, one shallow annular non-filling of not more than 40 mm in width shall be allowed, with the smallest wall thickness at these points being 2 mm larger than the nominal wall thickness of the given pipe size.
On the inner surface of the outwardly planted ends of pipes of type 2, traces of defect correction and certain gently sloping metal defects are allowed:
a) for pipes with a nominal diameter of 60−102 mm — a depth of up to 2 mm, a length of up to 25 mm in circumference and a width of up to 15 mm, in an amount not exceeding three;
b) for pipes with a nominal diameter of 114−140 mm — a depth of up to 3 mm, a length of up to 50 mm in circumference and a width of up to 20 mm, in an amount not exceeding three.
The content of sulfur and phosphorus in the steel should not be more than 0.045% of each.
Pipes and couplings must be made of the steel strength groups specified in the table.

Supplier — AvekGlob Company — offers to purchase connecting elements to drill pipes in the assortment that meet the technical requirements of GOST 631−75. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.