AISI 1055 Steel Seamless tube,

AISI 1055 Steel Seamless tube, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1055 Steel Seamless tube, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI 1055 Steel, Cold Drawn, Annealed, 19-32mm (0.75-1.25 in) Round Bar** **AISI 1055, Cold Drawn & Annealed** in the 19-32mm diameter range is a **medium-high carbon steel bar** processed to deliver an optimal combination of consistent dimensional accuracy, excellent surface finish, good machinability, and uniform mechanical properties. This product is ideal for applications requiring higher strength and wear resistance than low-carbon steels (like 1018) can provide, but where the material must still be readily machinable and formable before any final heat treatment. The cold drawing process enhances strength and improves surface quality and dimensional tolerances. The subsequent annealing treatment softens the material, relieves internal stresses induced by cold working, and refines the microstructure, resulting in a bar that is straight, stable, and ready for precision machining or light cold forming. --- ## **1. Chemical Composition (Per AISI/SAE 1055 Standard)** The composition defines this as a plain carbon steel with a carbon content suitable for through-hardening. | Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | **Key Characteristic** | | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.50 - 0.60 | 0.60 - 0.90 | ≤ 0.040 | ≤ 0.050 | **Higher carbon for strength & hardenability.** | | **Role** | Primary contributor to strength and hardenability. | Increases hardenability and strength. | Impurity; kept low. | Impurity; controlled level. | Not a free-machining grade. | **Critical Features of the Composition:** * **Medium-High Carbon Content:** At 0.50-0.60% C, AISI 1055 has a higher carbon content than the common 1045. This provides a stronger base in the cold-drawn state and **greater potential for achieving high hardness (up to ~60-65 HRC) after quenching and tempering**. * **Non-Alloyed / Non-Free-Cutting:** It is a standard carbon steel without added alloys (like Cr, Mo) or elevated sulfur for machinability. This results in better transverse mechanical properties than free-machining grades but requires more robust machining parameters. * **Hardenability:** Possesses moderate hardenability suitable for oil quenching of sections within this diameter range to achieve a hardened structure. --- ## **2. Physical & Mechanical Properties (Cold Drawn & Annealed Condition)** The cold-drawn and annealed state provides a balance of properties tailored for manufacturing. | Property | **Typical Value - Cold Drawn & Annealed (19-32mm Dia.)** | **Technical Significance** | | :--- | :--- | :--- | | **Hardness** | **187 - 229 HB** (Approx. 89 - 97 HRB) | **Soft enough for good machinability** while providing a stronger starting point than hot-rolled. | | **Tensile Strength (Rm)** | **585 - 710 MPa (85 - 103 ksi)** | Higher than hot-rolled due to cold work, but reduced from full hard drawn by annealing. | | **Yield Strength (Rp0.2)** | **380 - 515 MPa (55 - 75 ksi)** | Good resistance to deformation. | | **Elongation (in 50mm / 2in)** | **≥ 15%** | Maintains good ductility for light forming. | | **Surface Finish** | **Smooth, scale-free.** Typical roughness ≤ 3.2 µm (125 µin) Ra. | **Superior to hot-rolled.** Ideal for parts where surface quality matters or for plating/painting. | | **Dimensional Tolerance** | Meets **ASTM A108** precision tolerances for cold-finished carbon steel bars (e.g., ±0.075mm to ±0.10mm for these diameters). | Excellent for precision machining, reducing setup time and material waste. | | **Straightness** | Excellent. | Critical for automated machining and long shaft applications. | | **Machinability** | **~60% of B1112.** Fair machinability. Requires appropriate feeds, speeds, and tool geometry. Produces a good surface finish. | | | **Response to Heat Treatment** | Excellent candidate for **quenching & tempering** or **induction hardening** after machining. | Can be hardened to 55-62 HRC for wear resistance. | --- ## **3. Product Applications** This specific form of AISI 1055 is widely used for machined components that require a combination of good initial machinability and the potential for high final strength. * **Shafts & Axles:** **Machine shafts, motor shafts, and light-duty axle shafts** that are machined and then heat-treated. * **Gears & Sprockets:** **Gear blanks and sprockets** that are machined before carburizing or through-hardening. * **Automotive Components:** **Bolts, studs, pins, and lever arms** requiring strength better than 1045. * **Tooling & Hardware:** **Chisels, punches, wrenches, and vise parts** that are often forged or machined and then hardened. * **Agricultural & Industrial Parts:** **Linkage parts, pins, and blades** subject to wear. --- ## **4. International & Equivalent Standards** AISI 1055 is a globally recognized grade with direct equivalents. | Standard System | Equivalent Grade | **Notes on Condition** | | :--- | :--- | :--- | | **AISI / SAE (USA)** | **1055** | The defining standard. | | **ASTM A108** | **Specification for Steel Bars, Carbon, Cold-Finished** | **Governing standard for the cold-drawn, annealed bar condition and tolerances.** | | **UNS** | G10550 | Unified Numbering System. | | **EN (DIN)** | **1.1206 (C55E / C55R)** | European equivalent. "C55E" is the engineering steel designation. | | **JIS** | **S55C** | Direct Japanese equivalent. | | **GB (China)** | **55# Steel** | Chinese equivalent. | **Key Distinction:** The product described is not just "AISI 1055 Steel," but specifically **"AISI 1055, Cold Drawn, Annealed, Round Bar to ASTM A108."** This specifies the form, process, and dimensional standards, ensuring procurement of a precision, quality-controlled product suitable for manufacturing, as opposed to commodity hot-rolled bar stock. --- ## **5. Key Advantages & Considerations** **Advantages:** * **Enhanced "As-Supplied" Properties:** Better strength, finish, and tolerances than hot-rolled material. * **Excellent Machining & Forming Base:** The annealed state provides uniform hardness for predictable machining and allows for light cold forming (bending, flattening). * **Superior Surface & Dimensional Quality:** Reduces or eliminates pre-machining steps like descaling or rough turning to achieve size. * **Good Hardenability:** Serves as an excellent, cost-effective substrate for a wide range of heat treatments to achieve high wear resistance. **Considerations:** * **Moderate Machinability:** Not a free-machining steel. Requires more power and careful tool selection than leaded or resulfurized grades. * **Limited Weldability:** Welding is possible but requires strict procedures (pre-heat, low-hydrogen electrodes, post-heat) due to the carbon content. Not recommended for critical welded structures. * **Not for Direct High-Stress Use:** In the annealed state, its strength is limited. High-performance applications require final heat treatment. * **Decarburization Possible:** The annealing process can cause a thin decarburized surface layer. For parts to be hardened, this layer may need to be mached off. --- **Disclaimer:** The mechanical property ranges provided are typical for the cold-drawn and annealed condition in the specified diameter range. For design purposes, especially for critical components, **consult the material certification from the supplier** for the specific lot's properties. Always specify the full product description including grade, condition, shape, size, and applicable standard (e.g., AISI 1055, CD Annealed, 25mm Round, per ASTM A108) when ordering. -:- For detailed product information, please contact sales. -: AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <5095 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1055 Steel Seamless tube, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1055 Steel Seamless tube, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1055 Steel Seamless tube, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Seamless tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1566 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition