Cold Rolled Seamless Precision Steel Pipe for Oil Cylinder

Type: Seamless Usage: Hydraulic/Automobile Pipe, Oil/Gas Drilling Specification: 6-68MM HS Code: 7304391000 Technique: Cold Drawn Trademark: HTSP Origin: China Product Description
Carbon steel precision pipe/tube (Cold drawn)

Pipe type: Seamless

Applications: Petroleum, chemical, power, gas, metallurgy, ship building, construction

Standard: DIN2391, DIN2393, DIN1629, EN10305-1, ASTM A519, ASTM A179, ASTM A192, ASTM A513

Grade: ST35, ST37(E235), ST45(E255), ST52 (E355), 20Cr (20Cr4)(5120), 40Cr (41Cr4) (5140), 30CrMo (4130), 42CrMo(4140), 38CrMoAlA(41CrAlMo07), 25Mn (1026)...

Outer Diameter: 1/8"-48"

Thickness: Sch10-Sch160, XXS, XS, STD

Length: SRL or DRL (As client's requirement)

Surface: Black rust-proof oil, transparent oil, hot galvanizing, 3PE, epoxy coating


Manufacture method: Cold rolled, hydraulic cold drawn.

Delivery condition:
BK BKW BKS GBK NBK
+C +LC +SR +A +N
Cold drawn/hardcold drawn/softstress relievingannealednormalized

Surface roughness: 1.6um max for cold drawn pipe without heat treating, 3.2um max for hea treated pipe.

Ovaity: 0.15mm max for pipe with OD below 150mm, 0.25mm max for pipe with OD below 219mm, 0.35mm max for pipe with OD aboe 220mm.

Straightness: 0.3mm/1000mm max, 0.8mm/1000mm max, 1.2mm/1000mm max.



Packing: In bundles tied with steel strips, oil coating, varnish, or black painting, end plastic caps.

Shipping: By containers.

Payment method: 30% deposit, balance before shipment or against copy of B/L or L/C at sight.

Warrany: 1 year after shipment of pipe.

Third party inspection or customer's inspection is accepable.

Addtional tests like hardness test, grain size test, ultrasonic test is acceptable.

Special requirements about ovality, surface roughness, straightness are acceptabe.

Delivery time: 30-60days as the real situation.

We also can special produce as our client's requirement.

Working method	Cylinder ID (mm)	Length (m)	Straightness (mm/m)	Tolerance on ID	Tolerance on WT	Roughness (μ m)
Cold drawn	40-320	≤ 12M	0.2-0.5	/	± 5%	0.8-1.6
Cold rolling	30-100	≥ 12M	0.2-0.5	/	± 5%	0.8-1.2
cold drawn-honed	40-500	8M	0.2-0.3	H8-H9	± 5%	0.2-0.8
Cold drawn-roll	40-400	7M	0.2-0.3	H8-H9	± 5%	≤ 0.4
Deep-hole	320-400	8M	0.2-0.3	H7-H9	± 8%	≤ 0.8
Deep-rolling	320-400	7M	0.2-0.3	H8-H9	± 8%	≤ 0.4

 

Final Supply Condition	Cold finished (Hard)(BK)		Cold drawn and stress-relieved (BK+S)			Hardness HB
Parameters	T. S obN/mm 2	Elongation δ 5%	T. S obN/mm 2	Y. S OsN/mm 2	Elongation δ 5%
20#	≥ 550	≥ 8	≥ 520	≥ 470	≥ 12	175
45#(CK45)	≥ 650	≥ 5	≥ 600	≥ 520	≥ 12	207
16Mn(ST52)	≥ 640	≥ 5	≥ 600	≥ 520	≥ 15	190
25Mn	≥ 640	≥ 5	≥ 600	≥ 510	≥ 15	195
27SiMn	≥ 840	≥ 5	≥ 800	≥ 720	≥ 10	230

 

ID Min.	(Tolerance on OD)μ m
	H7	H8	H9	H10
30	+21 0	+33 0	+52 0	+84 0
> 30-50	+25 0	+39 0	+62 0	+100 0
> 50-80	+30 0	+46 0	+74 0	+120 0
> 80-120	+ 35 0	+ 54 0	+87 0	+140 0
> 120-180	+40 0	+63 0	+100 0	+160 0
> 180-250	+46 0	+72 0	+115 0	+185 0
> 250-315	+52 0	+81 0	+140 0	+210 0
> 315-400	+57 0	+89 0	+170 0	+230 0

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