AISI 1074 Steel, hot rolled

AISI 1074 Steel, hot rolled, (discontinued) Product Information -:- For detailed product information, please contact sales. -: AISI 1074 Steel, hot rolled, (discontinued) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1074 Steel, hot rolled, (discontinued) Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1074 Steel, Hot-Rolled (DISCONTINUED)** #### **1. Overview & Discontinuation Status** **Product Status: Commercially Discontinued / Legacy Grade** AISI 1074 was a standard high-carbon, non-alloy steel supplied in the common hot-rolled condition (typically as rounds, flats, or bars). As a hot-rolled product, it featured a characteristic mill-scaled surface and a pearlitic microstructure, providing a good balance of as-supplied strength, machinability, and low cost. This made it a versatile raw material for components destined for subsequent forging, machining, and—most critically—final heat treatment (quenching and tempering) to achieve high hardness and wear resistance. **Reason for Discontinuation:** The primary driver for the obsolescence of AISI 1074 was **industry standardization and material rationalization**. Its chemical composition and mechanical properties fell almost entirely within the overlapping ranges of the more widely produced and specified adjacent grades: * **AISI 1070** (0.65-0.75% C) * **AISI 1078/1080** (0.72-0.85% C / 0.75-0.88% C) Mills, standards organizations (like SAE and ASTM), and end-users consolidated their specifications to reduce inventory complexity, streamline production, and simplify design engineering. Consequently, **AISI 1070 and AISI 1078/1080 have become the direct and fully qualified replacements** for all former AISI 1074 applications. --- #### **2. Historical Chemical Composition (per AISI/SAE)** The composition was central to its classification as a high-carbon steel. | Element | Content (%) (Typical for AISI 1074) | | :--- | :--- | | **Carbon (C)** | **0.70 - 0.80** | | **Manganese (Mn)** | 0.60 - 0.90 | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | ≤ 0.050 | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | **Note:** This carbon range sits precisely between, and overlaps with, AISI 1070 and AISI 1078. --- #### **3. Typical Historical Physical & Mechanical Properties (As-Hot Rolled)** Properties were measured in the black, as-rolled state. | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Hot-Rolled (with mill scale) | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Tensile Strength** | ~ 640 - 760 MPa (93 - 110 ksi) | | **Yield Strength (0.2% Offset)** | ~ 360 - 430 MPa (52 - 62 ksi) | | **Elongation (in 50 mm)** | ~ 10 - 14% | | **Hardness** | **190 - 235 HB** (Brinell) | | **Machinability** | **Fair (~50-55% of AISI 1212).** Acceptable in the as-rolled state for roughing; often annealed or normalized for better machinability in complex parts. | | **Weldability** | **Very Poor / Not Recommended.** The high carbon content makes it extremely prone to cracking in the heat-affected zone. | --- #### **4. Key Characteristics & Metallurgical Behavior** * **High Hardenability Potential:** Like all steels in this carbon range, AISI 1074 was valued for its ability to be hardened to high levels (up to 60-64 HRC) through quenching and tempering, providing excellent wear resistance. * **Moderate As-Rolled Properties:** Provided sufficient strength for handling and initial fabrication steps like cutting, straightening, or rough machining. * **Final Properties Heat-Treatment Dependent:** The as-rolled state was merely a starting point; the final performance was entirely determined by the subsequent thermal processing (austenitizing, quenching, and tempering). --- #### **5. Historical & Legacy Applications** In its time, AISI 1074 hot-rolled steel served as general-purpose feedstock for a variety of high-strength components, identical to those now made from AISI 1070 or 1078/1080: * **Forging Stock:** Used for drop forging or hammer forging into tools (wrenches, pry bars), agricultural implements (plow shares), and automotive components. * **Springs:** Material for manufacturing high-stress mechanical springs, such as heavy-duty coil springs and leaf springs, after appropriate forming and heat treatment. * **Cutting Tools & Blades:** Base material for industrial knives, shear blades, and mower blades. * **Wear Parts & Shafts:** Components like axles, pins, rollers, and chain links that required a hard, wear-resistant surface after case hardening or through-hardening. * **Hand Tools:** For tools requiring a durable, hardenable steel. --- #### **6. Relevant Historical Standards & Modern Replacements** Procurement for new projects should reference the standards for the replacement grades. | Standard System | Historical Designation | **Modern Replacement & Specification** | | :--- | :--- | :--- | | **AISI / SAE (USA)** | **1074 (Discontinued)** | **SAE J403: 1070** or **1078/1080** | | **UNS (USA)** | **G10740** | **G10700** or **G10780/G10800** | | **ASTM (USA)** | *Covered under general hot-rolled bar specs* | **ASTM A29/A29M:** Specify Grade **1070** or **1078**. | | | | **ASTM A576:** For special quality bars, Grade **1070** or **1078**. | | **DIN (Germany)** | (No direct equivalent) | **1.1231 / C70W2** (for ~1070) or **C75W2 / C80W2** (for ~1078/1080) per EN 10083-2. | | **JIS (Japan)** | (No direct equivalent) | **SWRH72B** (类似1070) or **SWRH77B/SWRH82B** (类似1078/1080) for wire rod equivalents. | | **GB (China)** | (No direct equivalent) | **70#** (类似1070) or **75#/80#** (类似1078/1080) per GB/T 699. | --- ### **Summary and Engineering Guidance** **AISI 1074 hot-rolled steel is a legacy material no longer actively produced to that specific grade designation.** Its discontinuation is a result of practical industry consolidation, not a performance deficiency. **For Design, Specification, and Procurement:** 1. **Do Not Specify AISI 1074** on any new drawing, bill of material, or purchase order. 2. **Select a Direct Replacement:** * **For applications where the historical 1074 was likely used for its upper-mid range carbon content:** Specify **AISI 1078 (UNS G10780)**. This is the most common and direct 1-to-1 functional replacement, offering virtually identical hardenability and final properties. * **If a slight margin in ductility for forging or a slightly lower as-rolled hardness is desired:** Specify **AISI 1070 (UNS G10700)**. This is also an excellent replacement and may be more readily available in some markets. 3. **For Legacy Equipment or Spare Parts:** If dealing with an old drawing specifying AISI 1074, consult with a qualified steel distributor or metallurgist. They will recommend supplying **AISI 1078** (or occasionally 1070) certified to meet the required chemical and mechanical property ranges. The replacement will perform identically in the finished, heat-treated component. The transition from AISI 1074 to 1070/1078 represents a successful simplification within the carbon steel industry, ensuring continued availability of high-performance materials without compromise. -:- For detailed product information, please contact sales. -: AISI 1074 Steel, hot rolled, (discontinued) Specification Dimensions Size： Diameter 20-1000 mm Length <4866 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 1074 Steel, hot rolled, (discontinued) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1074 Steel, hot rolled, (discontinued) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1074 Steel, hot rolled, (discontinued) -:- For detailed product information, please contact sales. -:

Packing of AISI 1074 Steel, hot rolled, (discontinued) -:- 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 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 1337 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