Cut ends of thick-walled rusty steel pipes stacked in a pile

Seamless Steel Pipe, Steel Pipe

Seamless Drill Pipe in G105 and S135 Grades

Name: Seamless Steel Pipe Drill Pipe
Brand: Tianyu Metal

Hollow section drill pipe with no joint around it for fluid media transport duty

Drill pipe is a seamless steel pipe with a hollow section and no joint around the circumference, produced to API SPEC 5DP and API SPEC7. It is bought by drilling contractors, workover service companies and oilfield supply houses that need tool joint grades G105 or S135 with Nc38 or Nc50 connections rather than plain line pipe. Supplying it in the API range lengths R1 R2 and R3 alongside fixed 5.8M 6M 9M and 11.8M cuts means the string can be made up without a separate cutting and threading step at the rig site. Surface treatment is chosen at order stage so pipe arrives black painted, galvanized, natural or with an anticorrosive coating already applied.

Request A Quote Ask For Specifications

Product Name — Seamless Steel Pipe Drill Pipe
Product Form — Seamless drill pipe
Standards — API SPEC 5DP and API SPEC7
Material — G105 or S135
Connection — Nc38 Nc50

Why It Is Specified

Key Benefits of Seamless Steel Pipe Drill Pipe

Built to API SPEC 5DP and API SPEC7

The pipe and its connection are quoted against the two API specifications drilling contracts normally reference. That keeps the paperwork aligned with the tender rather than requiring an equivalence argument.

G105 and S135 Tool Joint Grades

Both common high strength drill pipe grades are available from the same source, so a string can be stepped from G105 to S135 where the load case demands it.

Nc38 and Nc50 Connections

Connections are supplied in the Nc38 and Nc50 sizes already in use on most rotary strings, which avoids crossover subs being added just to match the order.

API Range Lengths Plus Fixed Cuts

Ranges R1 R2 and R3 are offered together with 5.8M 6M 9M and 11.8M fixed lengths and 2-12m random, so the joint length matches the derrick and handling equipment.

No Joint Around the Section

The pipe body is seamless with a hollow section and no joint around it, which removes a seam from the rotating and pressure carrying wall.

Coating Applied Before Shipment

Black painted, galvanized, natural, anticorrosive 3PE coated or polyurethane foam insulated finishes are applied at the mill so no field coating shop is needed on arrival.

Problems It Solves

What This Material Removes From Your Process

Connection Mismatch Across the String

Joints bought with the wrong connection need crossover subs that add length and failure points. Ordering in Nc38 or Nc50 to match the existing string keeps the make up direct.

Joint Length That Does Not Suit the Rig

A single fixed length rarely fits every derrick and handling system. Ranges R1 R2 and R3 plus 5.8M 6M 9M and 11.8M fixed cuts let the joint length be chosen for the rig.

Coating Work After Delivery

Pipe arriving bare has to be painted or coated before it can go into a corrosive service. Black painted, galvanized, 3PE coated or insulated finishes are applied before shipment.

Grade Called Out Without a Source

A drilling program may specify S135 while local stock only holds lower grades. Both G105 and S135 are quoted from the same order so the specified grade does not have to be downgraded.

Seam Concerns in Rotating Service

A welded body introduces a seam into a wall that rotates under load. The seamless body has a hollow section with no joint around it.

Application Scenarios

Where It Is Used

Oil and Natural Gas Drilling Strings

Rotary drilling strings transporting fluid media to the bit in oil and natural gas wells.

Workover and Service Rig Operations

Service strings on workover rigs where tool joint grade and connection size have to match the existing inventory.

Water Well and Geothermal Drilling

Drilling programs that follow the same API drill pipe practice for circulating drilling fluid down the hole.

Oilfield Supply and Rental Fleets

Rental fleets restocking G105 and S135 joints in Nc38 and Nc50 to keep hire strings complete.

Coated Pipe for Corrosive Wells

Strings for wells where anticorrosive 3PE coating or galvanizing is specified against the downhole or surface environment.

Who It Is For

Buyers Who Specify This Product

Drilling contractors buying G105 or S135 joints to complete a rotary string
Workover and well service companies replacing damaged joints in an existing Nc50 string
Oilfield equipment rental fleets restocking drill pipe in API range lengths
Oilfield supply distributors carrying drill pipe for regional drilling operators
Project procurement teams packaging drill pipe with coating already applied
Water well and geothermal drilling companies buying seamless drill pipe for circulation duty

Technical Data

Specifications and Technical Features

Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.

Seamless Steel Pipe Drill Pipe specifications
Product Name	Seamless Steel Pipe Drill Pipe
Product Form	Seamless drill pipe
Standards	API SPEC 5DP and API SPEC7
Material	G105 or S135
Connection	Nc38 Nc50
Outside Diameter	1/2 inch to 48 inch or customized
Wall Thickness	SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS or customized
Wall Range	1.65mm to 80mm
Length	R1 R2 R3 2-12m random 5.8M fixed 6M fixed 9M fixed 11.8M
Surface Treatment	Black painted galvanized natural anticorrosive 3PE coated polyurethane foam insulation
Place of Origin	China
Certification	ISO9001 BV SGS RoHS

Technical Features

Seamless pipe body with hollow section and no joint around it
Produced to API SPEC 5DP and API SPEC7
Grades G105 and S135
Connections Nc38 and Nc50
Outside diameter 1/2 inch to 48 inch or customized
Wall by schedule SCH5S to SCH160 and XS covering 1.65mm to 80mm
Lengths R1 R2 R3 2-12m random 5.8M 6M 9M and 11.8M fixed
Surface black painted galvanized natural anticorrosive 3PE coated or polyurethane foam insulated

Materials

Drill pipe grade steel supplied as G105
Higher strength drill pipe grade steel supplied as S135
Tool joint material matched to the Nc38 or Nc50 connection size

Certification

ISO9001
BV
SGS
RoHS
Mill test certificate supplied with each shipment

Manufacturing

How It Is Made and Processed

Seamless pipe body production giving a hollow section with no joint around it
Heat treatment to reach the G105 or S135 grade requirement
Upsetting and preparation of the pipe ends for the tool joint
Machining of the Nc38 or Nc50 connection
Cutting to the ordered range or fixed length
Surface treatment by painting galvanizing 3PE coating or insulation
Thread protection marking and bundling for export

Quality Control

Checks Before It Ships

Grade confirmed as G105 or S135 against the order before release
Connection size checked as Nc38 or Nc50 with thread protectors fitted
Outside diameter and wall verified against the ordered schedule
Length checked against the ordered range or fixed cut
Coating condition inspected before bundling
Mill test certificate issued with the shipment

Customization

What We Can Change on Your Order

Grade nominated as G105 or S135 per line item
Connection specified as Nc38 or Nc50
Length supplied as R1 R2 R3 or as a 5.8M 6M 9M or 11.8M fixed cut
Outside diameter and wall outside the standard listing on request
Surface treatment selected from black paint galvanizing 3PE coating or polyurethane foam insulation
Thread protectors and bundling arranged to the handling method at destination

Comparison

Seamless Steel Pipe Drill Pipe Against the Alternatives

Welded steel pipe used as a drill string	The seamless body has a hollow section with no joint around it, so there is no longitudinal seam in a wall that rotates under load.
Plain seamless line pipe	Drill pipe is made to API SPEC 5DP and API SPEC7 with G105 or S135 grade and a machined Nc38 or Nc50 connection rather than a plain pipe end.
Lower grade drill pipe	S135 is available alongside G105 from the same order so the higher strength grade can be placed where the load case needs it.
Bare pipe coated after delivery	Black paint, galvanizing, 3PE coating or polyurethane foam insulation is applied before shipment, removing a coating step at destination.

Use Guide

Specifying Handling and Welding Notes

State the grade connection and range together because all three have to match the existing string
Check derrick height and handling equipment before choosing between R1 R2 and R3 or a fixed cut
Keep thread protectors on both ends until the joint is on the rig floor
Store joints on racks clear of the ground so the coating is not damaged in the yard
Nominate the surface treatment against the well environment rather than taking the default finish
Ask for the mill test certificate so grade and connection are documented in the string record

Questions Buyers Ask

Seamless Steel Pipe Drill Pipe FAQ

Which drill pipe grades do you stock?

G105 and S135. Both can appear on the same order so a string can be built with the higher grade only where it is needed.

What connections are available?

Nc38 and Nc50. Tell us which connection your existing string uses so the joints make up without a crossover sub.

What lengths can you cut to?

Ranges R1 R2 and R3, 2-12m random, and fixed cuts of 5.8M 6M 9M and 11.8M.

Which specification is the pipe made to?

API SPEC 5DP and API SPEC7.

Can the pipe arrive already coated?

Yes. Black painted, galvanized, natural, anticorrosive 3PE coated and polyurethane foam insulated finishes are applied before shipment.

What wall thicknesses can you supply?

Wall is ordered by schedule from SCH5S to SCH160 and XS, covering 1.65mm to 80mm, or to a stated figure if you prefer.

Do you issue a mill test certificate with drill pipe?

Yes, a mill test certificate ships with the material, and ISO9001 BV SGS and RoHS documentation is available on request.

Same Range

Industries and Guides Related to This Product

Steel pipes with orange plastic end caps stacked indoors

Oil Gas and Pipelines

Pipeline and wellsite buyers are not really buying steel, they are buying a pressure boundary and the paperwork that proves it. Th

Steel plates and sheets stacked in an open storage yard

Mining and Bulk Material Handling

Mines quarries and bulk terminals buy steel to stand between abrasive material and the structure carrying it, so the order is usua

Need a Price on Seamless Steel Pipe Drill Pipe

Send the grade, thickness, width and quantity you need together with your destination port. A cutting list or drawing gets you a firmer number.

Chat on WhatsApp Email Us View All Products