AISI M1012 Merchant Quality Carbon Steel Seamless tube

AISI M1012 Merchant Quality Carbon Steel Seamless tube, Composition Spec Product Information -:- For detailed product information, please contact sales. -: AISI M1012 Merchant Quality Carbon Steel Seamless tube, Composition Spec Synonyms -:- For detailed product information, please contact sales. -:

AISI M1012 Merchant Quality Carbon Steel, Composition Spec Product Information -:- For detailed product information, please contact sales. -: # Product Datasheet: AISI M1012 Merchant Quality Carbon Steel - Composition Specification ## 1. Product Overview **AISI M1012 Merchant Quality (MQ) Carbon Steel** is a standardized, low-carbon steel formulation designated for general-purpose manufacturing and construction applications. The "M" prefix indicates **Merchant Quality**, signifying that the material is produced and supplied primarily to meet specific **chemical composition requirements** rather than guaranteed mechanical properties. This quality designation represents the most economical tier of standardized steel, optimized for applications where cost-effectiveness and consistent chemical composition are prioritized over certified mechanical performance. M1012 MQ steel bridges the gap between generic "mild steel" and more expensive, property-guaranteed grades, offering fabricators a predictable material with known welding, forming, and machining characteristics based on its controlled chemistry. ## 2. Key Specifications & International Standards * **AISI/SAE Designation:** **M1012** (The "M" prefix is critical, denoting Merchant Quality) * **UNS Designation:** **G10120** (Note: Shares the same UNS number as standard AISI 1012; the "M" quality is a procurement specification) * **Governing Standard:** **ASTM A283/A283M** - Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates (Grades A, B, C, D). M1012 typically aligns with the chemical requirements for such general-purpose plates. * **Relevant Complementary Standards:** * **ASTM A36/A36M** - Structural Steel (M1012 may be supplied as a chemical equivalent for non-critical applications, but A36 has mandatory mechanical property requirements). * **ASTM A570/A570M** - Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality (Gr 30, 33, 36, 40, 45). * **CSA G40.21** - Canadian Standard for Structural Quality Steel. **Quality Philosophy:** The core tenet of **Merchant Quality** is the guarantee of **chemical composition** within specified limits. Mechanical properties (tensile strength, yield strength, elongation) are **not guaranteed** by the material specification and are considered typical or indicative values that result from standard hot-rolling practices. **Common Product Forms:** Hot-rolled bars, structural shapes (angles, channels), plates, and occasionally sheets. ## 3. Chemical Composition (%, Specification Requirements) The chemical composition is the definitive and guaranteed characteristic of AISI M1012 Merchant Quality steel. | Element | Composition Range (Weight %) | Role & Manufacturing Implication | | :--- | :--- | :--- | | **Carbon (C)** | **0.10% - 0.15%** | Primary strengthening element. This range provides a balance: sufficient strength for many applications while maintaining good weldability and formability. Higher within range increases strength but reduces ductility. | | **Manganese (Mn)** | **0.30% - 0.60%** | Secondary strengthener and deoxidizer. Combines with sulfur to form manganese sulfides, improving hot workability. Enhances hardenability slightly. | | **Phosphorus (P)** | **≤ 0.040% max** | Residual element. Generally considered an impurity that can increase strength and hardness but severely reduces ductility and impact toughness, especially in cold conditions. Tightly controlled. | | **Sulfur (S)** | **≤ 0.050% max** | Residual element. Improves machinability when controlled but forms iron sulfides which can cause "hot shortness" (cracking during hot working). Level is balanced for general fabrication. | | **Silicon (Si)** | **≤ 0.10% max (typical)** | Deoxidizer. Added during steelmaking to remove oxygen. A small amount increases strength without significantly harming ductility. Often lower in MQ grades than in fully killed steel grades. | | **Copper (Cu)** | **≥ 0.20% min (when specified)** | *Optional.* When required per ASTM A283, a minimum copper content is specified to enhance atmospheric corrosion resistance (approximately 2x that of plain carbon steel). | **Key Distinction from "Special Quality":** Merchant Quality steels typically have less restrictive controls on residual elements (like copper, nickel, chromium) compared to "Special Quality" (SQ) or "Structural Quality" grades, which may have maximum limits to ensure predictable weldability and toughness. ## 4. Typical Physical & Mechanical Properties (Indicative) *Crucial Notice: The following properties are **typical** for hot-rolled M1012 MQ steel. They are provided for engineering reference and design estimation but are **NOT guaranteed** by the Merchant Quality specification. Actual properties can vary between heats, mills, and sections.* | Property | Typical (Indicative) Range | Condition & Notes | | :--- | :--- | :--- | | **Tensile Strength** | 380 - 480 MPa (55 - 70 ksi) | Hot-rolled, as-supplied. Result of composition and rolling practice. | | **Yield Strength (0.2% Offset)** | 250 - 310 MPa (36 - 45 ksi) | Hot-rolled, as-supplied. A key design property, but variability must be accounted for. | | **Elongation in 50 mm (2 in)** | 25% - 32% | Hot-rolled. Indicates good ductility for forming. | | **Hardness (Brinell)** | 110 - 135 HB | Hot-rolled. Suitable for many machining operations. | | **Modulus of Elasticity (E)** | 200 GPa (29,000 ksi) | Standard for carbon steels, independent of strength grade. | | **Density** | 7.85 - 7.87 g/cm³ | Standard for ferritic steel. | | **Machinability** | ~60% (vs. 1212 as 100%) | Fair to Good. Better than lower-sulfur grades, but not a free-machining steel. | | **Weldability** | **Excellent** | Due to low carbon equivalent (CE ≈ C + Mn/6 ≈ 0.15-0.23). No preheat required for most thicknesses. All common processes (SMAW, GMAW, GTAW) are suitable. | | **Hardenability** | Very Low | Cannot be through-hardened by quenching. Can be **case hardened (carburized)** to create a wear-resistant surface over a tough, ductile core. | ## 5. Product Characteristics & Application Philosophy **The "Merchant Quality" Rationale:** This specification exists for applications where: 1. **Design Stresses are Well Below Material Capacity:** A large safety factor inherently accommodates material variability. 2. **Fabrication Response is Paramount:** Consistent weldability, bendability, and cutability are more critical than a specific yield strength. 3. **Function is Non-Critical:** The component's failure would not lead to safety hazards, major operational failure, or significant financial loss. 4. **Cost Optimization is Essential:** It provides a known-material baseline at the lowest possible price for a standardized grade. **Fabricator's Responsibility:** When using MQ steel, the **end-user/fabricator assumes the responsibility** for qualifying the material's "as-received" properties for their specific application through in-house testing or by applying conservative design safety factors. ## 6. Typical Applications M1012 MQ steel is specified for a vast range of general fabrication where its balanced properties and low cost are advantageous: **Construction & Infrastructure:** * Non-load-bearing structural brackets and supports * Temporary structures, formwork, and shoring * Walkway grating supports, stair stringers (light duty) * Architectural features and decorative metalwork * Building hardware, anchors, and base plates (for non-critical loads) **Manufacturing & Industrial Equipment:** * Machine bases, frames, and guards (for non-precision machinery) * Workbenches, shelving, and storage rack components (light/medium duty) * Conveyor frames and guards * Housing and enclosures for electrical or mechanical equipment * Agricultural equipment frames and components (non-stressed) **Transportation & Automotive:** * Trailer sub-frames and components (light-duty) * Truck body supports and brackets * Non-safety-related automotive brackets and mounts * Wheel chocks, dock boards **Consumer & General Products:** * Furniture frames (commercial and residential) * Signage frames and supports * Hand tools (e.g., shovel handles, pry bar shafts) * Exercise equipment frames * General repair and maintenance stock in metal service centers ## 7. Comparison with Other 1012 Variants and Quality Designations | Grade/Designation | Primary Focus | Guarantees | Cost | Best Used For | | :--- | :--- | :--- | :--- | :--- | | **AISI M1012 (Merchant Quality)** | **Chemical Composition** | **Chemistry Only** | **Lowest** | General fab, high safety factor designs, non-critical parts. | | **AISI 1012 Commercial Quality (CQ)** | Dimensional Consistency & Surface | Chemistry, Dimensions, Surface | Low | Parts requiring good appearance and consistent gauge for light forming. | | **AISI 1012 Structural Quality (SQ)** | **Minimum Mechanical Properties** | Chemistry **and** Mech. Properties (Yield, Tensile) | Higher | Load-bearing applications where design is based on guaranteed minimum strength. | | **ASTM A36** | Structural Properties | Strict Mech. Prop. & Chemistry | Medium-High | General structural applications (bridges, buildings, frames). | ## 8. Procurement, Processing & Quality Assurance **Procurement Specifications Must Clearly State:** * "AISI M1012 Merchant Quality" or "ASTM A283 Grade X (with M1012 chemistry)" * Desired product form (bar, plate, shape), size, and quantity. * **Any supplementary requirements** (e.g., Cu for corrosion resistance, special testing). **Processing Considerations:** * **Welding:** No restrictions. Use common fillers (E70XX, ER70S-X). * **Forming:** Excellent for hot-forming; good for cold bending and rolling. * **Machining:** Use positive rake tools, moderate speeds/feeds. * **Heat Treatment:** Not used for through-hardening. Annealing (if needed) at 870-925°C. **Quality Assurance for the Fabricator:** 1. **Certificate of Analysis:** The mill/supplier should provide a chemical analysis report. 2. **Incoming Inspection:** Consider performing periodic hardness or tensile tests to establish a statistical baseline for your supply. 3. **Design Factor:** Apply a larger safety factor in design calculations to account for potential property variation. 4. **Supplier Qualification:** Source from reputable service centers that understand and document the MQ distinction. ## 9. Important Remarks & Limitations **AISI M1012 Merchant Quality steel is an appropriate and economical choice when:** * The application is **non-critical** and **non-code** governed. * The designer/fabricator understands and accepts the **variability in mechanical properties**. * The primary need is a **predictable, weldable, formable low-carbon steel** at the best price. **DO NOT SPECIFY M1012 MQ FOR:** * **Safety-critical or load-bearing structural applications** (use ASTM A36 or SQ grades). * Applications governed by building codes or pressure vessel codes that require certified mechanical properties. * Components subject to dynamic, cyclic, or impact loading without extensive validation testing. * Any application where consistent, batch-to-batch mechanical performance is essential for function or safety. **Final Note:** The "M" prefix is a critical piece of procurement language. It communicates a specific business and technical agreement between buyer and seller regarding the guarantees supplied with the material. Always confirm with your supplier that the material meets the intended application's requirements. --- *This datasheet describes the standardized specification for AISI M1012 Merchant Quality Carbon Steel. Properties are typical and informational. For each application, the end-user is responsible for determining the suitability of the material. Consult with a professional engineer for critical applications.* -:- For detailed product information, please contact sales. -: AISI M1012 Merchant Quality Carbon Steel, Composition Spec Specification Dimensions Size： Diameter 20-1000 mm Length <5411 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 M1012 Merchant Quality Carbon Steel, Composition Spec Properties -:- For detailed product information, please contact sales. -:

Applications of AISI M1012 Merchant Quality Carbon Steel Seamless tube, Composition Spec -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI M1012 Merchant Quality Carbon Steel Seamless tube, Composition Spec -:- For detailed product information, please contact sales. -:

Packing of AISI M1012 Merchant Quality Carbon Steel Seamless tube, Composition Spec -:- 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 1882 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