Seamless Steel Pipe

Seamless Steel Pipe Manufacturing Process

Mandrel Mill Process

In the Mandrel Mill Process, a solid round (billet) is used. It is heated in a rotary hearth heating furnace and then pierced by a piercer. The pierced billet or hollow shell is rolled by a mandrel mill to reduce the outside diameter and wall thickness which forms a multiple length mother tube. The mother tube is reheated and further reduced to specified dimensions by the stretch reducer. The tube is then cooled, cut, straightened and subjected to finishing and inspection processes before shipment.

Manner man plug mill process

In the Plug Mill Process, a solid round (billet) is used. It is uniformly heated in the rotary hearth heating furnace and then pierced by a Manner man pieces. The pierced billet or hollow shell is roll reduced in outside diameter and wall thickness. The rolled tube simultaneously burnished inside and outside by a reeling machine. The reeled tube is then sized by a sizing mill to the specified dimensions. From this step the tube goes through the straightener. This process completes the hot working of the tube. The tube (referred to as a mother tube) after finishing and inspection, becomes a finished product.

Types	Uses
Structure Purposes	General structure and mechanical
Liquid Services	Petroleum, gas and other fluids conveying
Low and Medium Pressure	Steam and boiler manufacturing
Hydraulic Pillar Service	Hydraulic support
Auto Semi-shaft Casing	Auto seam-shaft casing
Line Pipe	Oil and gas conveying
Tubing and Casing	Oil and gas conveying
Drill Pipes	Well drilling
Geological Drilling Pipes	Geological drilling
Petroleum Cracking Tubes	Furnace tubes, heat exchange

Pipe types	Pipe Szie(mm)		Tolerances
Hot rolled	OD	<50	±0.50mm
		≥50	±1%
	WT	<4	±12.5%
		≥4～20	+15%, -12.5%
		>20	±12.5%
Cold drawn	OD	6～10	±0.20mm
		10～30	±0.40mm
		30～50	±0.45
		>50	±1%
	WT	<1	±0.15mm
		>1～3	+ 15%, – 10%
		>3	+ 12.5%, – 10%

Standard

Grade

Chemical Components (%)

Mechanical Properties

c

Si

Mn

P

S

Mo

Cr

V

Tensile STrength(Mpa)

Yield STrength(Mpa)

Elongation

(%)

ASTM A53

A

≤0.25

/

≤0.95

≤0.05

≤0.06

≤0.15

≤0.40

≤0.08

≥330

≥205

≥29.5

B

≤0.30

/

≤1.2

≤0.05

≤0.06

≤0.15

≤0.40

≤0.08

≥415

≥240

≥29.5

Standard

Grade

Chemical Components(%)

Mechanical Properties

c

Si

Mn

P

S

Mo

Cr

V

Tensile STrength

(Mpa)

Yield STrength

(Mpa)

Elongation(%)

ASTM A106

A

≤0.30

≥0.10

0.29-1.06

≤0.035

≤0.15

≤0.40

≤0.08

≥415

≥240

≥30

B

≤0.35

≥0.10

0.29-1.06

≤0.035

≤0.15

≤0.40

≤0.08

≥485

≥275

≥30

Standard	Grade	Chemical Components(%)					Mechanical Properties
		c	Si	Mn	P	S	Tensile STrength(Mpa)	Yield STrength(Mpa)	Elongation(%)
ASTM A179	A179	0.06-0.18	/	0.27-0.63	≤0.035	≤0.035	≥325	≥180	≥35

Standard	Grade	Chemical Components(%)					Mechanical Properties
		c	Si	Mn	P	S	Tensile STrength(Mpa)	Yield STrength(Mpa)	Elongation(%)
ASTM A192	A192	0.06-0.18	≤0.25	0.27-0.63	≤0.035	≤0.035	≥325	≥180	≥35

Standard	Grade	Chemical Components				Tensile STrength(min)	Yield Strength(min)
Standard	Grade	C	Mn	P	S	Mpa	Mpa
API 5L PSL1	A	0.22	0.90	0.030	0.030	331	207
	B	0.28	1.20	0.030	0.030	414	241
	X42	0.28	1.30	0.030	0.030	414	290
	X46	0.28	1.40	0.030	0.030	434	317
	X52	0.28	1.40	0.030	0.030	455	359
	X56	0.28	1.40	0.030	0.030	490	386
	X60	0.28	1.40	0.030	0.030	517	414
	X65	0.28	1.40	0.030	0.030	531	448
	X70	0.28	1.40	0.030	0.030	565	483

Standard	Grade	Chemical Components				Tensile STrength(min)	Yield Strength(min)
Standard	Grade	C	Mn	P	S	Mpa	Mpa
API 5L PSL2	B	0.24	1.20	0.025	0.015	414	241
	X42	0.24	1.30	0.025	0.015	414	290
	X46	0.24	1.40	0.025	0.015	434	317
	X52	0.24	1.40	0.025	0.015	455	359
	X56	0.24	1.40	0.025	0.015	490	386
	X60	0.24	1.40	0.025	0.015	517	414
	X65	0.24	1.40	0.025	0.015	531	448
	X70	0.24	1.40	0.025	0.015	565	483
	X80	0.24	1.40	0.025	0.015	621	552

Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating

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