Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

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. 
Drilling pipe
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
> 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
%
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
7.3 The number of samples
The number of samples of the performance test each batch of steel pipe in accordance with Table 6.
7.4 reinspection judgment rules
  The reinspection of steel pipe and decision rules should be consistent withthe provisions of GB / T 2102.
6  
GB / T 9808-2008
8 packaging, marking and quality certification
8.1 steel tube the flag position should steel pipe from the outer surface of the tube end point between about 800mm to 000mm .
8.2 steel tube packaging, marking and quality certification should be consistent with the provisions of GB / T 2102.

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