You location: Home > Seamless Steel Drilling pipe,API Drilling Pipes

Seamless Steel Drilling pipe,API Drilling Pipes

We are offering our clients a wide range of API Seamless Steel Drilling pipe,API Drilling Pipes, which are available following Specifications :-
1) Drill pipe OD: 2 3/8", 2 7/8", 3 1/2", 4", 4 1/2", 5", 5 1/2"
2) API drill pipe Steel Grade: E75,X95,G105,S135
3) Type of end finish : EU-external upset, IEU-internal & external upset
4) All seamless steel drill pipes are made according to API 5 Drill pipe standards.
5) We can provide seamlesssteel pipe according to customers' requirements.
6) Wall thickness: 7 - 12.7 mm or 2 3/8"-5 1/2"
7) Length: 5.49-12.5m
Regarding the API Seamless Steel Drilling Pipes, the OD from 2 3/8” to 5 1/2” and steel grade from E75 to S135. Mainly used in oil and gas exploration and development process of deep well, horizaontal well and extended reach well. With the Hardbading and Internal Coating.

Geological drilling seamless steel pipe

1 Scope

This standard specifies the geological drilling seamless steel pipe size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate.

This standard applies to the geological core drilling, water well drilling, coal fields, drilling, hydrogeological drilling drilling with casing material, the core tube materials casing collar material, drill pipe materials and tool joints material, no drill collar joints material pipe joints.

2 normative references

The terms of the following documents by the standard reference in the provisions of this standard. Dated reference documents, all subsequent amendments (excluding corrections) or revisions do not apply to this standard, however, the latest versions of these files can be used to encourage the parties to reach an agreement by the standard whether . Those who are not dated reference documents, the latest versions apply to this standard.

GB / T 222 steel the finished chemical composition allows deviation

GB / T 223.3, steel and alloy chemical analysis method two security for the determination of phosphorus content than the Lin methane phosphomolybdate gravimetric method

GB / T 223.59 steel and alloy chemical analysis method antimony phosphorus molybdenum blue photometric method for the determination of phosphorus content

GB / T 223.61 steel and alloy chemical analysis method phosphomolybdate amine volumetric method for the determination of phosphorus content

GB / T 223.62 steel and alloy chemical analysis method butyl acetate extraction and spectrophotometric determination of phosphorus content

GB / T 223.67 Methods for chemical analysis of steel and alloy reduction and distillation - methylene blue photometric method for the determination of sulfur content

GB / T 223.68 steel and alloy chemical analysis of potassium iodate titrationmethod pipe furnace burning sulfur content

GB / T 223.72 Methods for chemical analysis of steel and alloy alumina chromatographic separation - barium sulfate gravimetric method for the determination of sulfur content

GB / T 228 metallic materials at room temperature tensile test method (GB / T 228-2002, ISO 6892:1998, eqv)

GB / T 2102 steel pipe inspection, packaging, marking and quality certificate

GB / T 2975 steel and steel products, mechanical testing location and sample preparation (GB / T 2975-1998, ISO377: 1997, eqv)

GB / T 4336 carbon steel and low alloy steel spark source atomic emission spectrometry (convention)

GB / T 5777 seamless steel pipe ultrasonic testing method ( GB / T 5777-1996, ISO 9303:1989, eqv)

GB / T 20066 Steel and iron chemical composition was measured with a sample of the sampling and sample preparation method (GB / T 20066-2006, ISO 14284:1996, IDT)

3 Order content

Order contract should include the following information:

a) standards Numbers;

b) the product name;

c) steel grades;

d) Order number (total weight or total length);

e) Delivery state;

f) sizes;

g) Special requirements.

4 size, shape and weight

4.1 outside diameter and wall thickness

4.1.1 Pipe nominal outside diameter and nominal wall thickness shall conform to the requirements in Table 1.

Table 1 steel pipe nominal outside diameter and nominal wall thickness

Name	Outside diameter,mm	Wall thickness,mm	Single weight, kg / m
Drill pipe material	33	6	3.99
	42	5	4.56
	42	7	6.04
	50	5.6	6.13
	50	6.5	6.97
	60.3	7.1	9.31
	60.3	7.5	9.77
	73	9	14.20
	73	9.19	14.46
	89	9.35	18.36
	89	10	19.48
	114	9.19	23.75
	114	10	25.65
Drill pipe joint material	76	8	13.42
	91	8	16.37
	91	10	19.97
	110	8	20.12
	110	10	24.66
	130	8	24.07
	130	10	29.59
	150	8	28.01
	150	10	34.52
	171	12	47.05

Table 1 (continued)

Name	Outside diameter,mm	Wall thickness,mm	Single weight, kg / m
Casing material, core tube material	73	4.5	7.60
	89	4.5	9.38
	108	4.5	11.49
	127	4.5	13.59
	146	5	17.39
	168	6.5	25.89
	168	8	31.56
	194	7	32.28
Casing collar material	73	5.5	9.16
	73	6.5	10.66
	89	6.5	13.22
	89	8	15.98
	108	6.5	16.27
	108	8	19.73
	127	6.5	19.31
	146	6.5	22.36
	168	8	31.56
Drill collar joints material	68	20	23.67
	68	16	20.52
	76	20	27.62
	83	25	35.76
	89	25	39.46
	105	25	49.32
	121	28	64.21

4.1.2 according to the requirements of the demand side, the supply and demand sides consultation, can supply steel pipe diameter and wall thickness.

4.2 diameter and wall thickness of the allowable deviation

4.2.1 steel pipe outside diameter ( D) tolerances shall comply with the provisions of Table 2.

Table 2 steel pipe outer diameter allowable deviation millimeters

Steel pipe types	Allowable deviation
Hot rolled steel pipe(extrusion)	± 0.75% D or ± 0.50, whichever is greater
Cold drawn (rolled)steel pipe	± 0.50% D or ± 0.20, whichever is greater

4.2.2 steel pipe wall thickness ( S) tolerances shall comply with the requirements in Table 3.

The wall thickness of the steel pipe in Table 3 allow deviation in millimeters

Steel pipe types	Pipe wall thickness	Allowable deviation
Hot rolled steel pipe (extrusion)	≤ 10	+15% S -10% S or ± 0.40, whichever is greater
Hot rolled steel pipe (extrusion)	> 10	± 10% S
Cold drawn (rolled)	-	± 8% S or ± 0.15, whichever is greater

4.2.3 According to the demand side, the buyer and the seller negotiated and specified in the contract to produce Table 2, Table 3 other than those specified size allowable deviation pipe.

4.3 length

4.3.1 usual length

The usual length of steel pipe 4 000 mm ~ 12 500 mm. The buyer and the seller negotiated and specified in the contract, the delivery of a length greater than 12 500 mm steel pipe.

4.3.2 cut to length and double length

According to the buyer's requirements and specified in the contract, the steel pipe can be cut to length length or double length delivery. Cut lengths of steel pipe in the usual length range, full-length allowable deviation shall comply with the following provisions:

a) Length length ≤ 6 000 mm, 0 to 10 mm;

b) Length Length> 6 000 mm, 0 to 15 mm.

Times foot total length of the steel pipe should be in the range of usual length, full-length allowable deviation as follows: + 20mm 0mm , each double length should stay out of the incision margin following provisions:

a) outside diameter ≤ 159 mm, the incision margin mm 5 mm ~~ ;

b) outside diameter> 159 mm incision margin for mm 10 mm ~~ .

4.4 curvature

4.4.1 Steel Pipe bending requirements shall comply with the requirements of Table 4.

Table 4 Steel Pipe bending

Steel pipe nominal wall thickness,mm	The degree of curvature, mm / m
≤ 15	≤ 1.5
> 15	≤ 2.0

4.4.2 of the full length of the steel tube bending degrees should not be greater than the total steel pipe length of 1.5 ‰.

4.5 ovality and wall thickness deviation

According to the requirements of the demand side, the buyer and the seller negotiated and specified in the contract, ovality and wall thickness of steel pipe shall respectively not more than 80% of the outside diameter and wall thickness tolerances .

4.6-side head shape

4.6.1 the outer diameter of the steel pipe is not greater than 60mm, the steel pipe cut oblique should not exceed 1.5mm; cut oblique outer diameter of the steel pipe is greater than 60 mm, the steel pipe should not exceed 2.5% of the pipe diameter, but the maximum is not should not exceed 6mm.

4.6.2 incision burrs must be removed.

4.7 Delivery Weight

4.7.1 Steel Pipe actual weight of the delivery, the delivery also theoretical weight. Steel theoretical weight calculated according to the provisions of GB / T 17395, the density of steel to take 7.85kg/dm .

4.7.2 According to the requirements of the demand side , the buyer and the seller negotiated and specified in the contract, the deviation of the theoretical weight and the actual weight of the steel pipes of delivery shall comply with the following provisions:

Single vessel steel pipe: ± 10%;

Each batch of minimum the 10t steel pipe: ± 7.5%.

5 Technical Requirements

5.1 steel grade and chemical composition

5.1.1 steel pipe steel grade DZ380, DZ500, DZ550 and DZ600.

5.1.2 of the chemical composition of the steel pipe (melting component), P ≤ 0.035% S ≤ 0.035%.

5.1.3 When the demand side is asked to do product analysis , should be specified in the contract. The chemical composition of the finished steel pipe tolerances shall comply with the provisions of GB / T 222.

5.2 manufacturing method

5.2.1 steel manufacturing method

Should be an electric furnace or basic oxygen furnaces steel manufacturing.

After a consultation between the other smelting method of manufacture may be used. Demand side, specify a smelting method, it should be specified in the contract.

5.2.2 billets method of manufacturing

Tube hot rolling (forging) manufacturing, steel ingot or continuous casting method also can be directly used as billets.

5.2.3 The method of producing a steel pipe

Steel pipe should be hot-rolled (extrusion) or cold drawn (rolled) seamless method of manufacture. Demand side, specify a method to manufacture steel pipe,

Should be specified in the contract.

5.3 Delivery Status

　 Hot-rolled steel pipe (extrusion) to the hot-rolled state or heat treatment delivery, the demand side requires treatment delivery, to be specified in the contract. Cold drawn (rolled) steel pipe to heat treatment delivery.

5.4 Mechanical Properties

The delivery state longitudinal tensile properties of steel pipe shall conform to the provisions in Table 5.

Table 5 mechanical properties of the steel pipe

No.	Steel grade	Tensile strength,R M MPa	Lower yield strength, R el MPa	Elongation, A %
No.	Steel grade	Not less than
1	DZ380	640	380	14
2	DZ500	700	500	13
3	DZ550	750	550	13
4	DZ600	780	600	12

5.5 surface quality

Steel inner and outer surface does not allow visible cracks, folding, scarring, rolling, folding and abscission. These defects should be completely clear, clear the depth of the negative deviation should not exceed the nominal wall thickness of the actual clean-up at the wall thickness of not less than the minimum thickness deviation allowed.

Other local defects does not exceed the wall thickness negative deviation is allowed to exist.

5.6 ultrasonic testing

Steel pipe ultrasonic testing should be the requirements of GB / T 5777's by-branch. The contrast sample tube outer surface of the longitudinal groove depth level, cold drawn (rolled) pipe the C8, hot-rolled (extrusion, expansion) steel C10 execute.

6 Test methods

6.1 the size and shape of the steel pipe should be in conformity with the requirements of precision measuring tools to measure.

6.2 steel pipe external surfaces should be visually inspected in sufficient lighting conditions.

6.3 steel pipe inspection shall comply with the requirements in Table 6.

7 Inspection rules

7.1 Inspection and acceptance

Inspection and acceptance by the steel pipe for the technical supervision departments.

7.2 group approved the principle of

7.2.1 Steel Pipe sets of inspection and acceptance.

7.2.2 double length seamless pipe, if the pipe is cut into single longer heat treatment from multiple lengths long seamless pipe interception pipe section should be treated as one.

7.2.3 Each batch should be the same grade, the same steel grade, the same specifications and the same heat treatment (heat) steel pipe. The quantity of each batch of steel pipe should not exceed the following requirements:

Outside diameter of not more than 76mm, and wall thickness of not greater than 3mm 400 root;

Other size 200 root.

7.2.4 root of the number of remaining steel pipe, such as not less than the predetermined 50% is classified as a separate group, less than the predetermined 50% of the same grade and the same specifications can be incorporated adjacent batch.

Table 6 steel pipe test items, test methods, sampling quantity

No.	Test items	Number of samples	Sampling methods	Test methods
1	Chemical composition	Take one sample per furnace	GB / T 20066	GB / T 223 GB / T 4336
2	Tensile test	Each batch of a steel pipe to take a sample	GB / T 2975	GB / T 228
3	Ultrasonic testing	By the root	-	GB / T 5777