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Cold-Drawn Precision Seamless Tube


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Cold-drawn precision seamless tube with inner diameter up to 3000 mm and straightness ≤0.5 mm/m. Offering IT7–IT10 tolerances, ID to H7–H10, and inner surface roughness Ra ≤0.4 μm. Available in carbon, alloy, and stainless steels with flexible heat treatment and surface finishing options. Ideal for hydraulic cylinder barrels and precision machinery. Custom dimensions, tolerances, and packaging on request.

Model:
PZPT0001
Brand:
PAZON

Cold Drawn Seamless Tube Precision Steel Tube Hydraulic Cylinder Tube Honed Tube Stock Cold Drawn Pipe Seamless Precision Tube Cylinder Barrel CDS Tube Precision Tubing High Precision Steel Tube

Product Description

Our Cold-Drawn Precision Seamless Tubes are manufactured from high-quality seamless steel billets through a controlled cold-drawing process, achieving superior dimensional accuracy, excellent straightness, and a smooth inner surface. Ideal for hydraulic cylinder barrels, pneumatic cylinders, and precision machinery, these tubes can be supplied in a wide range of materials, heat treatment conditions, and surface finishes to meet the most demanding applications.

Technical Specifications

Inner Diameter: up to 3000 mm
Length: ≤ 16000 mm
Straightness: ≤ 0.5 mm/m
Material:
- Carbon Steel: 20# / CK45 / ST52(E355) / 25Mn / E235 / E470
- Alloy Steel: 27SiMn / 42CrMo (AISI 4140) / AISI 4130 / 40Cr / E460 / 20Cr
- Stainless Steel: ASTM 316L / 304
Tolerance Grades: IT7 – IT10
ID Tolerance: ISO H7 / H8 / H9 / H10 (customizable upon request)
Heat Treatment:
- Stress Relieved: +SR / BKS
- Annealed: +A / GBK
- Normalized: +N / NBK
- Quenched and Tempered: Q+T
- Nitrocarburized: QPQ
Surface Treatment: Hard Chrome Plating / Zinc Plating / Nickel Plating / Laser Cladding / QPQ
Wall Thickness Tolerance: ±7.5% (±10% for wall thickness > 210 mm)
Inner Surface Roughness: Ra ≤ 0.4 μm
Packing: Anti-rust oil + Plastic caps + Wooden case / Bundle with steel strip / Bundle with knitting strip

Features & Benefits

High Precision: Tight dimensional tolerances and excellent straightness reduce machining allowance and assembly time.
Superior Inner Surface: Ra ≤ 0.4 μm ensures optimal sealing performance and minimal friction for hydraulic applications.
Wide Material Portfolio: Carbon, alloy, and stainless steels to match strength, weldability, and corrosion resistance requirements.
Flexible Heat Treatment: Delivery conditions from stress-relieved to quenched and tempered allow tailoring of mechanical properties.
Customizable Finishes: A full range of surface treatments extends service life in harsh environments.

Customization Options

We offer tailored solutions to your exact specifications:

Custom ID/OD dimensions and wall thickness
Non-standard lengths (up to 16 m)
Special tolerance grades beyond H7-H10
Custom heat treatment cycles
Surface treatments including chrome, nickel, zinc plating, laser cladding, and QPQ
Custom packaging (wooden crates, anti-corrosion wrapping, etc.)
Material certifications and third-party inspection upon request

Technical Reference Data

Limits and Fits Table / Inner Diameter

The table below lists the upper (ES) and lower (EI) deviations for standard bore tolerances H7, H8, H9, and H10. Use this reference to select the correct fit for your hydraulic cylinder or precision assembly. Custom tolerances available on request.

Limits and Fits Table / Inner Diameter
ID / mm	H7		H8		H9		H10
ID / mm	ES	EI	ES	EI	ES	EI	ES	EI
>6-10	+0.015	0	+0.022	0	+0.036	0	+0.058	0
>10-18	+0.018	0	+0.027	0	+0.043	0	+0.070	0
>18-30	+0.021	0	+0.033	0	+0.052	0	+0.084	0
>30-50	+0.025	0	+0.039	0	+0.062	0	+0.100	0
>50-80	+0.030	0	+0.046	0	+0.074	0	+0.120	0
>80-120	+0.035	0	+0.054	0	+0.087	0	+0.140	0
>120-180	+0.040	0	+0.063	0	+0.100	0	+0.160	0
>180-250	+0.046	0	+0.072	0	+0.115	0	+0.185	0
>250-315	+0.052	0	+0.081	0	+0.130	0	+0.210	0
>315-400	+0.057	0	+0.089	0	+0.140	0	+0.230	0
>400-500	+0.063	0	+0.097	0	+0.155	0	+0.250	0
>500-630	+0.070	0	+0.110	0	+0.175	0	+0.280	0
>630-800	+0.080	0	+0.125	0	+0.200	0	+0.320	0
>800-1000	+0.090	0	+0.140	0	+0.230	0	+0.360	0
>1000-1250	+0.105	0	+0.165	0	+0.260	0	+0.420	0
>1250-1600	+0.125	0	+0.195	0	+0.310	0	+0.500	0
>1600-2000	+0.150	0	+0.230	0	+0.370	0	+0.600	0
>2000-2500	+0.175	0	+0.280	0	+0.440	0	+0.700	0
>2500-3150	+0.210	0	+0.330	0	+0.540	0	+0.860	0

Chemical Composition

This table provides the typical chemical analysis (C, Si, Mn, P, S, V, Ni, Cr, Al, etc.) for our most commonly supplied carbon and alloy steel grades, including 20#, 45#, Q345B/D, 25Mn, 27SiMn, E355 (ST52), SAE1026, E460, 4130, and 4140.

Chemical Composition
Material	C%	Si%	Mn%	P%	S%	V%	Ni%	Cr%	Al%
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	/	≤0.300	≤0.250	/
Q345B	≤0.20	≤0.50	1.00-1.60	≤0.030	≤0.030	≤0.080	≤0.250	≤0.030	/
Q345D	≤0.20	≤0.50	1.00-1.60	≤0.030	≤0.030	≤0.150	≤0.250	≤0.250	≥0.015
25Mn	0.22-0.29	0.17-0.37	0.70-1.00	≤0.035	≤0.035	/	/	/	/
27SiMn	0.24-0.32	1.10-1.40	1.10-1.40	≤0.035	≤0.035	/	≤0.300	≤0.300	/
E355(ST52)	≤0.22	≤0.55	≤1.60	≤0.025	≤0.025	/	≤0.250	≤0.250	/
SAE1026	0.22-0.28	0.15-0.35	0.60-0.90	≤0.040	≤0.050	/	/	/	/
E460	≤0.22	≤0.60	1.20-1.60	≤0.030	≤0.030	≤0.200	≤0.800	≤0.300	≥0.020
4130	0.28-0.33	0.15-0.35	0.40-0.60	≤0.040	≤0.040	/	/	0.80-1.10	/
4140	0.36-0.43	0.15-0.35	0.75-1.00	≤0.040	≤0.040	/	/	0.80-1.10	/

Delivery Condition

Cold-drawn precision tubes can be supplied in various heat treatment conditions. The table below summarizes the common abbreviations, corresponding DIN designations, reference numbers, and brief notes for each condition: Cold drawn (hard), cold drawn & stress relieved, annealed, normalized, and quenched & tempered.

Delivery Condition
Condition Category	Common Abbreviation	DIN No.	Notes
Cold drawn (Hard)	+C	BK	Thermal treatment shall not be used after final cold-drawing or cold-rolling.
Cold drawn and stress released	+SR	BKS	Stress relief annealing of steel tube shall be conducted after final cold-drawing or cold-rolling.
Annealed	+A	GBK	Annealing of steel tube shall be conducted after final cold-drawing.
Normalized	+N	NBK	Normalizing of steel tube shall be conducted after final cold-forming.
Quenched and tempered	Q+T		Quenching and tempering of steel tube shall be conducted after final cold-forming or normalizing.

Mechanical Properties

The table below gives typical mechanical properties (tensile strength, yield strength, elongation, and impact values) for selected materials under different delivery conditions (+C, +SR, +A, +N). Materials include 20# (A106, ST45), 45#, Q345B, Q345D, 25Mn, 27SiMn, E355 (ST52), E460, and SAE1026.

Mechanical Properties

Material

+C

+SR

+A

+N

T.S.

E.L.

T.S.

Y.S.

E.L.

Impact Value

T.S.

E.L.

T.S.

Y.S.

E.L.

Impact Value

Rm/MPa

A/%

Rm/MPa

Rel/MPa

A/%

KV2/J(-20°C)

Rm/MPa

A/%

Rm/MPa

Rel/MPa

A/%

KV2/J(-20°C)

20#(A106, ST45)

≥550

≥8

≥520

≥375

≥15

-

≥390

≥21

≥440

≥255

≥21

-

45#

≥650

≥5

≥600

≥520

≥10

-

≥390

≥14

≥540

≥340

≥18

-

Q345B

≥640

≥5

≥600

≥520

≥14

-

≥450

≥22

≥490

≥355

≥22

34

Q345D

≥640

≥5

≥600

≥520

≥14

27

≥450

≥22

≥490

≥355

≥22

34

25Mn

≥640

≥5

≥600

≥510

≥15

-

≥430

≥20

≥460

≥300

≥20

-

27SiMn

≥800

≥5

≥760

≥610

≥10

-

≥600

≥10

-

≥430

≥14

-

E355(ST52)

≥640

≥5

≥600

≥520

≥14

-

≥450

≥22

≥490

≥355

≥22

34

E460

≥690

≥620

≥13

-

≥650

-

SAE1026

≥640

≥5

≥600

≥510

≥15

-

≥430

≥20

≥460

≥300

≥20

-

Honed Tube Partial Dimensional Specifications (ID × OD)

The table below shows a selection of commonly available inner and outer diameter combinations for our cold-drawn precision tubes, which also serve as ideal stock for further honing or skiving operations. Additional sizes can be manufactured to order.

Honed Tube Partial Dimensional Specifications (ID × OD)
ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm
40	50	90	110	135	159	190	210	300	351
40	55	90	114	135	160	190	215	300	356
50	55	95	110	140	152	190	220	300	377
50	60	95	115	140	159	190	225	320	340
50	63	100	107	140	160	200	213	320	351
50	65	100	107	140	165	200	216	320	356
50	68	100	108	140	168	200	219	320	370
50	70	100	110	140	170	200	220	320	377
55	70	100	112	140	180	200	225	320	402
60	70	100	114	145	170	200	230	320	426
60	73	100	115	150	160	200	232	350	370
60	75	100	120	150	168	200	235	350	377
60	76	100	118	150	170	200	245	350	400
60	78	100	121	150	175	200	250	350	402
60	80	100	125	150	180	220	235	350	426
63	73	100	127	150	194	220	240	360	380
63	75	105	125	155	180	220	245	360	402
63	76	110	120	160	168	220	250	360	426
63	78	110	121	160	170	220	255	360	450
63	83	110	125	160	175	220	260	360	480
65	80	110	127	160	180	220	266	380	426
65	85	110	130	160	184	220	270	400	420
65	90	110	133	160	185	220	273	400	440
70	80	110	140	160	190	225	250	400	450
70	82	110	146	160	194	230	245	400	460
70	83	115	130	160	195	230	260	400	470
70	85	115	135	160	203	230	273	400	480
70	90	120	130	165	190	240	273	400	490
70	95	120	140	165	205	250	266	400	500
75	85	120	145	170	200	250	273	400	508
75	90	125	132	180	194	250	280	400	520
75	95	125	133	180	200	250	290	400	550
80	86	125	135	180	203	250	299	420	440
80	90	125	140	180	205	250	300	420	510
80	92	125	145	180	208	250	325	420	550
80	93	125	150	180	210	250	351	450	550
80	95	125	152	180	213	260	300	450	470
80	100	125	159	180	215	280	299	500	530
80	102	125	168	180	216	280	323	500	590
80	108	130	150	180	219	280	325	570	600
85	100	130	152	180	220	280	355	580	620
90	100	130	155	180	235	288	351	600	630
90	102	130	156	185	205	288	377	600	720
90	105	130	159	185	215	300	320	700	850
90	108	130	160	185	220	300	350	800	1000