Production method

The manufacturing method of precision honing tube, heating: heating the tube blank in an annular furnace; piercing: hot tube blank is pierced by a piercing machine; annealing: annealing the tube blank; borax: removing oxide scale; hot rolling: introducing the annealed tube blank into the rolling Pipe mill hot rolling; tube stripping: separating the rolled tube from the mandrel; stress relief annealing: introducing the rolled tube into a heating furnace and heating to obtain an annealed tube blank; pickling treatment: removing the rust on the surface; phosphating treatment: The chemically formed film of zinc phosphate is formed on the surface; saponification treatment: forming a lubricating film such as metal soap; primary cold drawing: cold drawing of the tube blank to be cold drawn; secondary cold drawing: cold drawing of a cold drawn tube The second cold drawing process, to obtain the cold drawn tube; heat treatment: reduce the residual stress; honing: use CNC honing machine; hot straightening treatment; to obtain the cold drawn precision honing tube.

Processing technology

(1) Material selection: select metal bars of suitable size that meet national standards as raw material bars for processing honing tubes.
(2) Billeting, free forging and heat treatment process: The raw bar is processed by the billeting, free forging and heat treatment process.
(3) Straightening: Forging hammer straightening is performed on the treated raw material bar.
(4) Drilling deep holes: After punching through holes of suitable size on the raw bar, the pipe is made.
(5) Honing: The through-hole of the pipe is honed with a honing stone, so that the through-hole of the pipe meets the size and machining accuracy requirements of the honed pipe.
(6) Lathe outer circle planing: The outer wall and end face of the pipe are machined and planed by a lathe, so that the outer diameter of the pipe meets the size and machining accuracy requirements of the honing pipe, and the production of the honing pipe is completed.

St52 E355 Hydraulic Cylinder Precision Honing Tube

St52 E355 Hydraulic Cylinder Precision Honing Tube
Section Shape	Round
Tolerance	±1%
Alloy Or Not	Non-Alloy
Thickness	1 - 60 mm
MOQ	5Ton
Length:	Client Requirement
Standard:	API, ASTM, GB, API 5L, API 5DP, ASTM A182-2001, ANSI A213M-2001,
Surface treatment	Black/Peeling/Polishing/Machined
Technique	cold rolled/drawn
Heat Treatment	Annealed; Quenched; Tempered
price terms	FOB,CRF,CIF,EXW all acceptable
Delivery Detail	inventory About 3-5； custom-made 10-15；rding to order's quantity.
Loading port	any port in China
Packing	standard export packing (inside:water proof paper,outside:steel covered with strips and pallets)
Payment Terms	T/T, L/C at sight,West Union,D/P,D/A,Paypal
Container size	20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High)
	40ft GP:12032mm(Length)x2352mm(Width)x2393mm(High)
	40ft HC:12032mm(Length)x2352mm(Width)x2698mm(High)

Executive standard

Standard	DIN2391, EN10305, ASTM A519, GB/T 3639-200
Material	Q355B Q355D C20,ST52,E355 SAE1026.CK45 4130 4140 STKM 13C
Heat treatment	BK+S
Specification	Outer diameter(mm) : 40-480mm
I.D Tolerance	H8-H9
Length	Fixed Length, Random Length(3--9m)or as requests of customers
Straightness	0.5-1/1000
ID roughness	RA 0.1-0.8micron(max)
Payment term	FOB, CFR, CIF ,EXW, FCA and so on
MOQ	3 tons
Technology	Honed & SRB(SKIVED AND ROLLER BURNISHED )
Application:	hydraulic cylinder, swivel crane, injection machine and so on
Conservation	anti rust oiled inside and outside surface, plastic caps in both ends
Package	bundle with steel strip and knitting strip, or wooden case

Chemical composition and properties of each grade

Steel Grade	C	SI	Mn	P	S	Cr	Ni	Cu
20#	0.17-0.24	0.17-0.37	0.35-0.65	0.035	0.035	0.250	0.250
45#	0.42-0.50	0.17-0.37	0.50-0.80	0.035	0.035	0.250	0.250
Q345B	≤0.2	≤0.5	1.00-1.60	0.030	0.030	0.030	0.250	0.08
Q345D	≤0.2	≤0.5	1.00-1.60	0.030	0.030	0.250	0.250	0.15
25Mn	0.22-0.29	0.17-0.37	0.70-1.00	0.035	0.035
27SiMn	0.22-0.32	1.10-1.40	1.10-1.40	0.035	0.035	0.300	0.300
E355	≤0.2	≤0.55	≤1.6	0.025	0.025
SAE1026	0.22-0.28	0.15-0.35	0.60-0.90	0.040	0.050

Steel Grade	Rm Mpa	ReH Mpa	Elonggation	cold finished Rm Mpa	cold finished Elonggation
20#	≥520	≥375	≥15	≥550	≥8
45#	≥600	≥520	≥10	≥640	≥5
16Mn(Q345B /D)	≥600	≥520	≥14	≥640	≥5
25Mn	≥600	≥510	≥15	≥640	≥5
27SiMn	≥760	≥610	≥10	≥800	≥5
St45	≥520	≥375	≥15	≥550	≥5
E355(st52)	≥600	≥520	≥14	≥640	≥5
SAE1026	≥600	≥510	≥15	≥640	≥5

Working method

Working method	range	ID	H8	H9	H10
cold drawn	25-250	30-50	+0.0390	+0.0620	+0.1000
cold rolling	25-150	50-80	+0.0460	+0.0740	+0.1200
cold drawn-honed	40-250	80-120	+0.0540	+0.0870	+0.1400
cold drawn-SRB	50-250	120-180	+0.0630	+0.1000	+0.1600
cold drawn -polished	40-250	180-250	+0.0720	+0.1150	+0.1850
cold drawn-polish-SRB	50-250	as required	as required	as required	as required

FAQ

Q:What is your terms of payment?

A:We usually accept T/T in advance, L/C for large sum.If you prefer other payments terms, please discuss.

Q:What is the terms of delivery?

A:EXW, FOB, CIF

Q:What is the terms of packing?

A:Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirements.

Q:What is your delivery time?

A:For products in stock, we can ship it within 7 days after receiving the deposit.For custom order, production time is 15-30

workdays after received the deposit.

Q:Could you produce according to the samples?

A:Yes, we could customer-made by your samples or technique drawings, we could build the mold and fixtures.

Q:Can I place an sample order and what is your MOQ if I accept your quality?

A:Yes, we can send you samples but you may pay the express fees, our MOQ is 1 ton.

Q:How could you guarantee your products?

A:We accept and support the third-party inspection.We also could issue the warranty to customer to guarantee the quality.

Q:Where is the port of shipment?

A:Ningbo or Shanghai sea port.

Q:How can I get the price of needed product?

A:It's the best way if you can send us the material, size and surface, so we can produce for u to check the quality.If you

still have any confusion, just contact us, we would like to be helpful.