Project Description
JIS G3465 STM C640 Seamless Steel Tube For Geological Drilling, Core Tube
Introduction
JIS G3465 STM C640 is a standard for seamless steel tubes designed for use in drilling applications, including as casing and core tubes. These tubes are made from carbon steel and alloy steel and are manufactured to withstand high pressures and temperatures encountered during drilling operations. The standard specifies the technical requirements, dimensions, and tolerances for these tubes, ensuring their quality and reliability in use. JIS G3465 STM C640 seamless steel tubes are commonly used in geological exploration drilling and other drilling applications where reliability and performance are critical.
Size
OD outsider diameter: 30 to 189 mm
WT wall thickness: 30 to 60 mm
Property
| Class | Chemical Composition,% | Tensile Strength min N/mm² |
|
| P max | S max | ||
| STM-C640 | 0.040 | 0.040 | 640 |
Length Tolerance
| Classification | Length |
| 20t.,(6m)or less in length | ±0.4in. (+10mm) 0 ( 0 ) |
| More than 20ft. (6m) in length | ±0.6in. (+15mm) 0 ( 0 ) |
Drift Test
| Nominal Diameter of Tube |
Drift Mandrel Size | |
| Outside Diameter | Length | |
| 1.69-3.27in. (43-83mm) | Inside diameter of tube — 0.04in. (1.0mm) | 12in. (300mm) |
Method of Manufacture
- The tube shall be manufactured by seamless process from steel ingot by the LD-converter or the electric furnace.
- The tube shall be furnished by the cold finished method or the hot finished method and suitably heat treated, if required.
Advantage
1 High strength: Geological drilling tubes are made from carbon steel and alloy steel, which gives them high strength and resistance to deformation, bending, and cracking. This makes them ideal for use in harsh drilling environments where other materials may fail.
2 High temperature and pressure resistance: Drilling tubes are designed to withstand high temperatures and pressures encountered during drilling operations. This allows them to maintain their integrity and function properly in harsh drilling conditions.
3 Corrosion resistance: Drilling tubes are often exposed to corrosive substances, such as drilling fluids and other chemicals. The materials used in geological drilling tubes are chosen for their high resistance to corrosion, ensuring that the tubes maintain their structural integrity and performance over time.
4 Accurate core sampling: Drilling tubes are used to extract core samples from the earth’s surface for analysis and identification of minerals. The precise dimensions and tolerances specified in the JIS G3465 standard ensure that core samples are extracted accurately and without damage to the surrounding rock.
Application
1 Oil and gas exploration: Drilling tubes are used to extract oil and natural gas from the earth’s surface. These tubes are used as casing and core tubes to extract core samples for geological analysis, or to line the drilled holes to prevent collapse.
2 Mineral exploration: Drilling tubes are also used in mineral exploration, including the exploration of coal, diamonds, gold, and other valuable minerals. The tubes are used to extract core samples from the earth’s surface for analysis and identification of minerals.
3 Geothermal drilling: Geothermal drilling is the process of drilling into the earth’s crust to extract heat for energy production. Drilling tubes are used in geothermal drilling to extract heat from deep within the earth and transport it to the surface for use.
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