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Honed Hydraulic Cylinder Tubing GB/T 3639

GB/T 3639 honed hydraulic cylinder tubing is made from precision cold-drawn or cold-rolled seamless steel grades 10#, 20#, 35#, 45#, and 25Mn. It offers high dimensional accuracy, smooth surface, and various mechanical properties depending on delivery condition. Widely used in hydraulic cylinders, machinery, automotive, construction, and agricultural equipment.

Description

GB/T 3639 10# 20# 35# 45# Honed Hydraulic Cylinder Tubing

Material Description

GB/T 3639 specifies Honed Hydraulic Cylinder Tubing (grades 10#, 20#, 35#, 45#, 25Mn) used in hydraulic cylinders, mechanical systems, and automotive components.

Chemical Composition

Steel Grade C (%) Si (%) Mn (%) P (≤ %) S (≤ %) Notes
10# 0.07–0.10 0.17–0.37 0.35–0.65 0.035 0.035 Cu ≤ 0.20% for hot-press use
20# 0.17–0.23 0.17–0.37 0.35–0.65 0.035 0.035
35# 0.32–0.39 0.17–0.37 0.50–0.80 0.035 0.035
45# 0.42–0.50 0.17–0.37 0.50–0.80 0.035 0.035

Mechanical Properties

Grade Condition Tensile (MPa) Yield (MPa) Elongation (%)
10# +C (BK) ≥ 410 ≥ 6
+LC (BKW) ≥ 375 ≥ 10
+SR (BKS) ≥ 335 ≥ 12
+A (GBK) ≥ 335 ≥ 24
+N (NBK) ≥ 205 ≥ 24
20# +C ≥ 510 ≥ 5
+LC ≥ 450 ≥ 8
+SR ≥ 430 ≥ 10
+A ≥ 390 ≥ 20
+N ≥ 245 ≥ 20
35# +C ≥ 590 ≥ 4
+LC ≥ 550 ≥ 6
+SR ≥ 520 ≥ 8
+A ≥ 510 ≥ 17
+N ≥ 315 ≥ 17
45# +C ≥ 645 ≥ 4
+LC ≥ 630 ≥ 5
+SR ≥ 610 ≥ 7
+A ≥ 590 ≥ 14
+N ≥ 355 ≥ 14

Execution Standard

Standard: GB/T 3639. Manufacturing: cold-drawn or cold-rolled. Delivery states include +C, +LC, +SR, +A, +N.

Applications

Extensively used for hydraulic cylinders, precision mechanical components, automotive parts; honed varieties (20# and 45#) serve aerial work platforms, agriculture, construction machinery, hydraulic jacks, etc.

Additional information

Application

Hydraulic Cylinder

Material

Alloy Steel, Carbon Steel

Steel Grade

10#, 20#, 25CrMo, 25Mn, 35#, 42CrMo, 45#, Q355B, Q420B

Technique

Cold Drawn, Cold Rolled, Galvanized, Hot Rolled

Tolerance

±1%

Outer Diameter

25-426mm

Wall Thickness

1-100mm

Alloy Or Not

Is Alloy

Shape

Customer Requirements, Rectangular, Round, Square

OEM

Allow

MOQ

1 Ton

Sample

Allow

Processing Services

Bending, Customers's Requirement, Cutting, Decoiling, Moulding, Punching, Welding

Packing

Customer Requirements, Nylon Braided Tape, Wooden Box

Payment Method

D/A, D/P, L/C, MoneyGram, T/T, Western Union

Custom Made

LOGO, Package, Spray Label

Certification

API, BSI, BV, CE, ISO14001, ISO9001, ROHS, SGS, TS16949, TUV

Secondary Or Not

Non-secondary

Company Profile

TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and

trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and

credibility among domestic and foreign customers.

The company’s production plant covers an area of over 10,000 square meters, with an annual production

capacity of 50,000 tons of materials and a comprehensive trading and warehousing capacity of 100,000 tons, which

can satisfy customers’ personalized needs for raw materials in terms of diversity and timeliness.

The group holds shares in more than ten domestic production entities, whose main products include

seamless steel pipes ( carbon steel and stainless steel), welded pipes ( carbon steel and stainless steel), pipe fittings

( carbon steel and stainless steel), titanium (titanium tubes, titanium rods, titanium cakes, titanium plates, etc.),

aluminum (aluminum tubes, aluminum rods, aluminum die casting, aluminum casting, CNC machining), and CNC

deep processing of metal materials such as tubes, rods, and casting parts.

Over the past 30 years, the company has been gradually developing new technologies and materials to meet

the growing needs of customers and various diversified needs, exporting to more than 56 countries and still

increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and

to facilitate one-stop purchasing for customers

Certificate

Workshop Show

Testing equipment

Package