AISI 316 Stainless Steel Round Tube / Stainless Steel Honing Tube for Hydraulic Equipment
Material
AISI 316 stainless steel pipe is an austenitic chromium-nickel-molybdenum stainless steel pipe specifically designed for corrosion-resistant applications. The addition of molybdenum to 316 pipe gives it better resistance to pitting and crevice corrosion than 304 stainless steel, making it widely used in chemical, water treatment, and marine environments. Its equivalent grades include UNS S31600 and EN 1.4401.
Specifications
Material: AISI 316 / UNS S31600 / EN 1.4401 / JIS SUS316
Product Name: Seamless Stainless Steel Round Tube, Honed if Available
Manufacturing Process: Cold Working / Seamless / Solution Annealing / Straightening
Surface Treatment: Honing of inner diameter, pickling and passivation or polishing of outer diameter (customizable)
Supply Method: Straight tube or cut to length
Customization: Outer diameter, inner diameter, wall thickness, length, inner diameter surface treatment, tolerances, and end processing can be customized according to drawings or purchase specifications.
Main Features
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It exhibits better corrosion resistance than 304 in humid, mildly corrosive, and chlorine-containing environments.
-
Honking the inner bore helps improve sealing performance, stabilize piston movement, and reduce the wear sensitivity of hydraulic cylinders. Surface finish is a key factor in seal quality.
-
It has good machinability, strong formability and weldability, and can be used for precision tubing and mechanical assembly. In cases where welding-related intergranular corrosion is a significant concern, 316L stainless steel can be selected.
Our Advantages
1. Q: Will the cylinder body quality affect seal life and leakage risk?
Yes, it will. Therefore, the cylinder body emphasizes precision-honed inner surfaces and strict dimensional consistency. Parker points out that good surface finish is crucial for sealing performance.
2. Q: Is standard 316 stainless steel sufficient for corrosive hydraulic environments?
316 stainless steel is usable only in environments with water and low chloride content, as its molybdenum content improves resistance to pitting corrosion, superior to 304 stainless steel. However, 316 stainless steel is not entirely immune to strong chloride or chloride stress corrosion cracking, especially in high-temperature or creviced environments. For welded components or more demanding applications, 316L, 316LN, or higher alloy stainless steels should be considered.
3. Q: Does this tubing conform to internationally recognized standards?
Yes. ASTM A511/A511M is a commonly used standard for seamless stainless steel tubing for machinery. For pressure- and corrosion-resistant seamless tubes, EN 10216-5, JIS G3459, GB/T 14976, and GOST 9941 are widely applicable standards.
Chemical Composition
| Grade |
EN No. |
C |
Si |
Mn |
P max |
S max |
N |
Cr |
Mo |
Ni |
Other |
| 316 |
1.4401 |
≤0.07 |
≤1.00 |
≤2.00 |
0.045 |
0.015 |
≤0.11 |
16.50–18.50 |
2.00–2.50 |
10.00–13.00 |
— |
| 316L |
1.4404 |
≤0.030 |
≤1.00 |
≤2.00 |
0.045 |
0.015 |
≤0.11 |
16.50–18.50 |
2.00–2.50 |
10.00–13.00 |
— |
| 316L |
1.4435 |
≤0.030 |
≤1.00 |
≤2.00 |
0.045 |
0.015 |
≤0.11 |
17.00–19.00 |
2.50–3.00 |
12.50–15.00 |
— |
| 316LN |
1.4406 |
≤0.030 |
≤1.00 |
≤2.00 |
0.045 |
0.015 |
0.12–0.22 |
16.50–18.50 |
2.00–2.50 |
10.00–12.50 |
— |
| 316Ti |
1.4571 |
≤0.08 |
≤1.00 |
≤2.00 |
0.045 |
0.015 |
≤0.11 |
16.50–18.50 |
2.00–2.50 |
10.50–13.50 |
Ti: 5×C to 0.70 |
Mechanical Properties
| Grade |
EN No. |
Hardness (HRB max) |
Yield Strength Rp0.2 (MPa min) |
Tensile Strength Rm (MPa) |
Elongation A (%) min |
| 316 |
1.4401 |
79 |
240 |
530–680 |
40 |
| 316L |
1.4404 |
79 |
240 |
530–680 |
40 |
| 316L |
1.4435 |
79 |
240 |
550–700 |
40 |
| 316LN |
1.4406 |
95 |
300 |
580–780 |
40 |
| 316Ti |
1.4571 |
95 |
240 |
540–690 |
40 |
Execution Standards
ASTM: ASTM A511/A511M — seamless stainless steel mechanical tubing and hollow bar for mechanical applications; ASTM A269 is also commonly referenced for austenitic stainless tubing in general service.
EN: EN 10216-5:2021 — seamless stainless steel tubes for pressure purposes and corrosion-resistant service.
GOST: GOST 9941-2022 — seamless cold-formed corrosion-resistant high-alloy steel pipes; technical specifications.
JIS: JIS G3459:2021 — stainless steel pipes for corrosion resistance, low-temperature, elevated-temperature, fire-fighting, and similar piping service.
GB: GB/T 14976-2025 — seamless stainless steel pipes for fluid transport; listed as current and effective from 2026-02-01.
Application Fields
General Application Areas: Hydraulic equipment, marine hardware, chemical equipment, water treatment systems, food and pharmaceutical auxiliary equipment, and general corrosion-resistant mechanical components.
Applications in these areas:
Hydraulic equipment: Honed cylinder barrels, actuator sleeves, corrosion-resistant cylinder bodies, precision moving parts.
Marine and offshore auxiliary equipment: Deck machinery components, seawater contact mechanical piping.
Chemicals: Pump sleeves, valves, fittings, delivery piping, instrumentation, and auxiliary process piping.
Water treatment: Filtration system piping, corrosion-resistant auxiliary piping, pump and valve assemblies.
Food and pharmaceutical auxiliary equipment: Cleanroom utility piping, flushing-resistant mechanical piping, auxiliary fluid handling components.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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