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{"title":"Heavy Wall Seamless Welded Carbon Steel Pipe A\/SA106B\/C A\/SA53B Standard Long","imgUrl":"https:\/\/img.chinax.com\/nimg\/ab\/c9\/9462bf309c0a98a6b05415e59bd7-200x200-1\/heavy_wall_seamless_welded_carbon_steel_pipe_a_2fsa106b_2fc_a_2fsa53b_standard_long_lifespan.jpg","attrs":{"Brand Name":"BEST","Model Number":"1\/2''-48''","Certification":"API, CE, PED, ISO","Place of Origin":"China\/Japan"}}
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Welded Smooth Bore E355+C Cylinder Tubes Inside H9 or H10
E355+C cylinder tubes and steel pipes represent a standardized carbon steel grade widely used for hydraulic and pneumatic cylinders, mechanical engineering parts, and precision pipes. Understanding the chemical composition is essential as it directly impacts weldability, machinability, toughness, and pressure resistance.
Understanding E355+C Designation
E355: A non-alloy (carbon) engineering steel grade according to EN 10305 standards (typically EN 10305-1 / -2 / -4 for precision and cylinder tubes).
"E" = Engineering steel
"355" ≈ minimum yield strength of approximately 355 MPa for the specified dimension range
"+C": Delivery condition "cold drawn/hard" (work-hardened) according to EN standards.
This condition provides higher strength and excellent dimensional accuracy, making it ideal for cylinder tubes and precision steel pipes.
Typical Chemical Composition of E355
Values may vary slightly between standards and manufacturers, but commonly accepted limits for E355 (per EN 10305-type steels) are approximately:
Element
Composition Range
Carbon (C)
max. ~0.22%
Silicon (Si)
up to ~0.55% (often max. 0.40–0.50%)
Manganese (Mn)
max. ~1.60% (typical range ~0.60–1.60%)
Phosphorus (P)
max. 0.025–0.035%
Sulfur (S)
max. 0.025–0.035%
Some manufacturers may also specify controlled levels of:
Nitrogen (N): controlled to prevent brittleness
Trace elements (Cu, Cr, Ni, Mo): typically each ≤0.30–0.35% unless otherwise specified
In practice, the steel is optimized for excellent weldability (low P, S, and moderate C), good toughness and formability, and sufficient strength for pressure-bearing cylinder tubes.
Applications in Cylinder Tubes and Steel Pipes
E355+C tubes are selected for cylinder and steel pipe applications because they provide:
Adequate strength for medium to high pressure: Carbon and manganese levels deliver optimal balance of strength and toughness
Excellent weldability and machinability: Controlled carbon content (around or below 0.22%) and low phosphorus/sulfur content ensure safe welding and machining of internal surfaces
Superior internal surface quality and dimensional accuracy: The "+C" (cold drawn) condition is ideal for honed or skived-and-roller-burnished cylinder tubes requiring tight tolerances and fine surface finishes for seals
Quality Verification Requirements
Important Note: Always confirm specifications with the exact standard and mill certificate. Different EN standards (EN 10305-1, EN 10305-2, EN 10305-4, etc.) may have slightly different chemical limits for the same "E355" designation, depending on product form (seamless, welded, precision, hydraulic tubes).
For critical applications:
Request the material test certificate (MTC / Mill Test Certificate, typically EN 10204 3.1)
Verify the exact standard cited (e.g., EN 10305-1 E355+C or EN 10305-4 E355)
Confirm: chemical composition, mechanical properties (yield, tensile strength, elongation), and impact values if required
Practical Summary
E355+C is a non-alloy engineering steel (EN 10305 series) typically featuring:
C ≤ 0.22%
Mn ≤ 1.60%
Si ≤ ~0.50–0.55%
P ≤ 0.025–0.035%
S ≤ 0.025–0.035%
Designed for optimal strength, weldability, and machinability, making it exceptionally suitable for hydraulic/pneumatic cylinders and precision steel pipes.
For precise specifications, provide the exact standard (e.g., EN 10305-1 or EN 10305-4) and product form (seamless vs. welded) to obtain specific standard clause details.
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
