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Drill Collar

Product: Drill Collar
Standard:API SPEC 7-1
Steel grade:AISI 4145H
Sizes:3 1/8" -- 11"
Connected Type:NC, IF, REG

+86 17865557227

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Product Details

Description

API SPEC 7-1 drill collar is made with rolling or forging AISI4145H chromium molybdenum alloy steel. Therefore, it needs to control chemical composition and the content of trace elements effectively.

Specification&Standard

Standard	Number	OD (in.)	ID (in.)	Length (ft)	Weight (lb/ft)	Typical Bending Strength Ratio
SY5144-2007/API7-1	NC 23-31	3-1/8	1-1/4	30	22	2.57:1
	NC 26-35 (2-3/8 IF)	3-1/2	1-1/2	30	27	2.42:1
	NC 31-41 (2-7/8 IF)	4-1/8	2	30 or 31	34	2.43:1
	NC 35-47	4-3 /4	2	30 or 31	47	2.58:1
	NC 38-50 (3-1/2 IF)	5	2-1/4	30 or 31	54	2.38:1
	NC 44-60	6	2-1/4	30 or 31	83	2.49:1
	NC 44-60	6	2-13 /16	30 or 31	76	2.84:1
	NC 44-62	6-1/4	2-1/4	30 or 31	91	2.91:1
	NC 46-62 (4 IF)	6-1/4	2-13 /16	30 or 31	84	2.63:1
	NC 46-65 (4 IF)	6-1/2	2-1/4	30 or 31	100	2.76:1
	NC 46-65 (4 IF)	6-1/2	2-13 /16	30 or 31	93	3.05:1
	NC 46-67 (4 IF)	6-3 /4	2-1/4	30 or 31	109	3.18:1
	NC 50-70 (4-1/2 IF)	7	2-1/4	30 or 31	118	2.54:1
	NC 50-70 (4-1/2 IF)	7	2-13 /16	30 or 31	111	2.73:1
	NC 50-72 (4-1/2 IF)	7-1/4	2-13 /16	30 or 31	120	3.12:1
	NC 56-77	7-3 /4	2-13 /16	30 or 31	140	2.70:1
	NC 56-80	8	2-13 /16	30 or 31	151	3.02:1
	6-5/8 API Reg	8-1/4	2-13 /16	30 or 31	162	2.93:1
	NC 61-90	9	2-13 /16	30 or 31	196	3.17:1
	7-5/8 API Reg	9-1/2	3	30 or 31	217	2.81:1
	NC 70-97	9-3 /4	3	30 or 31	230	2.57:1
	NC 70-100	10	3	30 or 31	243	2.81:1
	8-5/8 API Reg	11	3	30 or 31	300	2.84:1

Sreel Mark	Chemical Composition %
Sreel Mark	C	Si	Mn	P	S	Cr	Mo	Cu	Al
4145H	0.42~0.48	0.15~0.35	0.90~1.20	≤0.03	≤0.03	0.90~1.20	0.15~0.25	≤0.2	0.025~0.045
Other Elements:N≤0.015,Ni≤0.5

Drill Collar Mechanical Performance
Drill Collar Outside Diameter Range		Yield Strength		Tensile Strength		Elongation A%	HB	Charpy Impact Akv J
mm	in	MPa	Psi	MPa	Psi	Elongation A%	HB	Charpy Impact Akv J
79.4~171.4	3-1/8~6-3/4	≥758	≥110000	≥965	≥140000	≥13	285~341	≥54
177.8~279.4	7~11	≥689	≥100000	≥930	≥135000	≥13	285~341	≥54
Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand

Process

In the process of heat treatment, the drill collar has added a special normalizing process, which makes the thread part grain more refined, enhances the drill collar thread strength, and effectively improves the service life of the drill collar.

Packing

key word : Seamless Steel Pipe

APPLICATION FIELD

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