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GB/T9808 STM-R780 High Straightness Seamless Cold Drawn Steel Tube For Drilling

GB/T9808 STM-R780 High Straightness Seamless Steel Tubes for Drilling

our products apply to geological core drilling,water well drilling,hydrogeoligical drill,casing material for engineering drilling,core tube material and casing coupling Seamless Steel Tubes,ordinary drill pipe material and drill pipe joint Seamless Steel Tubes,rope coring drill pipe material and drill pipe joint Seammless Steel Tubes,drill collar material and drill collar lock joint Seamless Steel Tubes.

Size:

OD:33-340mm WT:2-28mm L:4000mm-12500mm

Steel Grade:

ZT380,ZT490,ZT520,ZT540,ZT590,ZT640,ZT740

The Production method:

Hot rolling(extrusion) or cold drawing(rolling) seamless method.

Delivery State:

Hot rolling(extrusion)steel tubes should be delivered with hot rolling condition or hot finished.Cold drawn(rolling) steel tubes should be delivered with hot finished.

Surface quality

There is no visual visible cracks,rolling, folding,scarring and abscission layer in the internal and external surfaces of the steel pipe.

Test:

Tensile tast

Ultrasonic inspection

Eddy current inspection

Magnetic flux leakage inspection

Tolerance of Outer Diameter and Wall Thickness

Standard	Production Method	Tube Size		Tolerance
GB/T 9808-2008	Hot rolled	OD		(+1.0%D) or +0.65 (-0.5%D) -0.35
		WT	≤10	(+15%S)or +0.45 (-10%S) -0.35
		WT	>10	(+12.5%S, -10%S)
	Cold Drawn(rolled)	OD		±0.50%D or ±0.20
	Cold Drawn(rolled)	WT		±8%S or ±0.15
Q(N)/ T118-2010	Cold Drawn	OD	OD	±0.40%D or ±0.20
Q(N)/ T118-2010	Cold Drawn	WT	WT	±7%S or ±0.15

Mechanical Property

No.	Grade	Tensile Strangth Rm/MPa	Specifies the non-proportional extension strength Rp0.2/MPa	Percentage elongation after fracture A/%
No.	Grade	No less than
1	ZT380	640	380	14
2	ZT490	690	490	12
3	ZT520	780	520^a	15^b
4	ZT540	740	540	12
5	ZT590	770	590	12
6	ZT640	790	640	12
7	ZT740	840	740	10
^a Grade ZT520 measure R_P0.5 ^bGrade ZT520 use tensile sample S4 S5 or S6 in GB/T 228

Application:

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Categories	Seamless Steel Tube
Brand Name:	TORICH
Model Number:	GB/T9808
Certification:	ISO14001:2008, TS16949, CE PED, TUV, API,BV
Place of Origin:	China
MOQ:	2 tons
Price:	negotiable
Payment Terms:	L/C, D/A, D/P, T/T, Western Union, MoneyGram,
Supply Ability:	20000 Tons per Year
Delivery Time:	30-45 Days
Packaging Details:	in wooden boxes or in hexagonal bundles
Product name:	GB/T9808 STM-R780 High Straightness Seamless Steel Tubes for Drilling
Material:	ZT380 ZT490 ZT520 ZT540 ZT590 ZT640 ZT740
Type:	Seamless Steel tube
Surface:	Oiled
Usage:	Drilling
Length:	4-12.5m
OD:	33-340mm
WT:	2-28mm
Shape:	Round