4145H Alloy Drill Pipe | SY/T 5290 4145H Alloy Steel Drill Pipe

Manufactured to SY/T 5290 standard, domestic high‑quality alloy drill pipe grade
Excellent abrasion‑resistance and impact‑resistance for harsh mine working condition
Inertia friction welding upset tool joint, stable high‑torque transmission performance
Multiple NC thread connections, standard R2 length 9.14m, match most mine drill rig
Complete mechanical test & NDT inspection, mill test certificate for each batch

Product Overview

4145H alloy drill pipe is domestic high‑strength alloy drill pipe manufactured under SY/T 5290 standard. Adopt inertia friction welding process to connect pipe body and upset thickened tool joints, outstanding anti‑abrasion and anti‑impact performance, specially fit for heavy‑duty mine drilling, rock bolt anchoring and high‑impact underground geological drilling.

4145H material owns comprehensive mechanical performance, high surface hardness, good toughness balance, widely used in mine ventilation drilling, rock bolt anchoring engineering, complex hard‑rock geological exploration. Supports NC26, NC31, NC38, NC40 thread connection, standard R2 length 9.14 meter.

All 4145H drill pipe pass dimension measurement, thread inspection, mechanical performance test and non‑destructive testing.

Drill Pipe

Chemical & Mechanical Property Snapshot

Grade	C (%)	Mn (%)	P (%) Max	S (%) Max	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HRC)
4145H	0.42‑0.49	0.65‑1.10	0.025	0.025	830‑980	≥980	≥14	28‑34

Detailed Technical Specifications

Item	Details
Product Name	4145H Alloy Drill Pipe
Applicable Standards	SY/T 5290
Material Grade	4145H
Common Outer Diameter	2‑3/8″, 2‑7/8″, 3‑1/2″, 4″, 4‑1/2″
Standard Length	R2:9.14 m
Tool Joint Type	Upset thickened tool joint
Welding Method	Inertia friction welding
Thread Connection	NC26, NC31, NC38, NC40
Connection Performance	High torque transmission, excellent abrasion & impact resistance
Application Scenario	Heavy‑duty mine drilling, rock bolt anchoring projects
Inspection Process	Dimensional measurement, thread inspection, mechanical property testing, NDT
Certification Document	Mill Test Certificate supplied for each batch
Thread Protection	Protective caps installed on both ends
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	7‑15 working days after receiving deposit
Package	Waterproof paper + galvanized steel strap + seaworthy export wooden pallet

Dimension Table

Nominal Size (inch)	OD (mm)	Wall Thickness (mm)	ID (mm)	Unit Weight (kg/m)	Thread Type	Standard Length Range
2-3/8″	60.33	4.83	50.67	16.02	NC26 / NC31	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
2-7/8″	73.03	5.51	62.01	23.29	NC31 / NC38	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
3-1/2″	88.90	5.49	77.92	29.76	NC38 / NC40	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4″	101.60	6.65	88.30	38.23	NC44	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4-1/2″	114.30	6.88	100.54	44.50	NC46 / NC50	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5″	127.00	7.52	111.96	53.41	NC50 / NC56	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5-1/2″	139.70	7.72	124.26	61.70	NC56 / NC61	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
6-5/8″	168.28	8.38	151.52	81.58	NC70	R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m

Product Comparison Table

Product	Main Function	Material / Standard	Key Characteristics	Typical Applications
S135 Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	API Spec 5DP, S135	Ultra‑high strength, heavy torque	Ultra‑deep oil‑gas well drilling
4145H Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	SY/T 5290,4145H alloy steel	Excellent abrasion and impact resistance	Heavy‑duty mine drilling, rock bolt anchoring projects
35CrMo Drill Pipe	Transfers torque and drilling force between surface equipment and drill bit	GB/T 2970,35CrMo alloy steel	Good toughness, stable dynamic‑load performance	Geological exploration, mine ventilation drilling

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Drilling for Oil and Gas Exploration

Water Well Drilling

Drilling for Geological Exploration

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is main usage for 4145H drill pipe?

Mainly for mine drilling, rock bolt anchoring and hard‑rock high‑impact geological drilling.

What standard applies for 4145H drill pipe?

Follow SY/T 5290 domestic alloy drill pipe standard.

Can 4145H drill pipe match international drilling rig?

Equipped with standard NC threads, compatible with mainstream international drilling rig equipment.

What is hardness range for 4145H grade?

Hardness HRC 28‑34.

What is MOQ for 4145H drill pipe?

MOQ 5 tons, small trial order negotiable.

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4145H Alloy Drill Pipe | SY/T 5290 4145H Alloy Steel Drill Pipe