ASTM A302 Steel Rod/Bar, grade C

ASTM A302 Steel Rod, grade C Product Information -:- For detailed product information, please contact sales. -: ASTM A302 Steel Rod, grade C Synonyms -:- For detailed product information, please contact sales. -:

ASTM A302 Steel, grade C Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A302 / A302M Grade C Steel Plate** **Product Overview** ASTM A302 Grade C is a **manganese-molybdenum-nickel alloy steel plate** specifically engineered for **intermediate and higher temperature service** in welded pressure vessels. It is part of the high-strength, quenched and tempered (Q&T) alloy plate family, designed to provide superior mechanical properties and enhanced toughness compared to carbon steel plates like ASTM A515/A516. Grade C offers a higher strength level than Grades A and B within the A302 specification, making it suitable for thicker sections and more demanding pressure applications where weight reduction or higher design stresses are critical. Its alloy composition and heat treatment ensure good performance in both elevated temperature and low-temperature environments. **Key International Standards** * **Primary Standard:** **ASTM A302 / A302M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel. * **Governing Specification:** This product conforms to all requirements for **Grade C** as defined in ASTM A302. * **Heat Treatment Condition:** Supplied in the **quenched and tempered (Q&T) condition**. This is mandatory to achieve the specified strength, toughness, and homogeneity, especially in thicker plates. * **ASME Designation:** **SA-302 Grade C** - The ASME Boiler and Pressure Vessel Code designation, which is required for code-stamped pressure equipment. * **Related Standards:** Often compared to other Q&T pressure vessel steels like ASTM A517 (high-strength) and is the alloy-steel counterpart to normalized grades like ASTM A204 (molybdenum steel). **Chemical Composition (Weight % - ASTM A302 Grade C Requirements)** The chemistry is balanced for hardenability, strength, and toughness, utilizing manganese, molybdenum, and nickel. | Element | ASTM A302 Grade C Requirement | Typical Range / Aim | | :--- | :--- | :--- | | **Carbon (C)** | 0.20% max | 0.15 - 0.20% | | **Manganese (Mn)** | 1.15 - 1.50% | 1.25 - 1.45% | | **Phosphorus (P)** | 0.035% max | ≤ 0.020% | | **Sulfur (S)** | 0.040% max | ≤ 0.015% | | **Silicon (Si)** | 0.15 - 0.40% | 0.20 - 0.35% | | **Nickel (Ni)** | **0.40 - 0.70%** | 0.50 - 0.65% | | **Chromium (Cr)** | -- | ≤ 0.25% (residual) | | **Molybdenum (Mo)** | **0.45 - 0.60%** | 0.50 - 0.58% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.50 - 0.58 | **Physical & Mechanical Properties** | Property | Requirement (ASTM A302 Grade C) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 80 - 100 ksi (550 - 690 MPa) | 85 - 95 ksi (586 - 655 MPa) | | **Yield Strength (0.2% Offset)** | 50 ksi (345 MPa) min | 55 - 65 ksi (380 - 450 MPa) | | **Elongation in 2" (Min)** | 18% (for plates ≤ 3/4") | Typically 20-25% | | **Charpy V-Notch Toughness** | Often specified by purchaser per ASTM A20. | **Excellent.** The Q&T process and nickel content typically yield high impact values (e.g., 40-60 ft-lb) at low temperatures (e.g., -50°F / -46°C), making it suitable for low-temperature pressure vessels. | | **Maximum Recommended Metal Temperature** | -- | Suitable for intermediate temperature service, with ASME allowable stresses defined up to **~800°F (427°C)**. Strength retention at high temperature is better than carbon steel but inferior to chromium-molybdenum alloys. | | **Key Feature** | **High-Strength Q&T Alloy Plate:** Combines a 50 ksi minimum yield strength with the exceptional through-thickness toughness and homogeneity of a quenched and tempered alloy steel, ideal for high-integrity, thick-walled pressure vessels. | **Product Applications** ASTM A302 Grade C is specified for critical pressure vessel components requiring a combination of high strength, good toughness, and performance at moderate temperatures. * **Heavy-Wall Pressure Vessels:** Reactors, separators, and knock-out drums in the oil, gas, and petrochemical industries, especially for vessels with large diameters and high design pressures. * **Nuclear Components:** Certain non-critical structural supports and components in nuclear power plants. * **Hydrogenation Reactors:** Where good H₂ resistance and strength are needed. * **High-Pressure Storage Spheres and Drums.** * **Heat Exchanger Shells** for high-pressure service. * **Transition Pieces** between carbon steel and higher alloy sections. **Advantages & Fabrication Notes** * **Demanding Welding Requirements:** Due to its Q&T condition and alloy content, welding requires strict procedure control: * **Preheat & Interpass Control:** Mandatory. Typical preheat range is **300-400°F (149-204°C)** to prevent hydrogen-induced cracking. * **Low-Hydrogen Practice:** Essential. * **Post-Weld Heat Treatment (PWHT):** **Almost always required.** PWHT temperatures must be below the original tempering temperature (typically 1100-1200°F / 593-649°C) to avoid overtempering and strength loss. Procedure qualification is critical. * **Excellent Toughness:** The nickel addition significantly enhances low-temperature impact resistance, allowing its use in refrigerated pressure vessels (e.g., for liquefied gases) when impact-tested. * **Good Through-Thickness Properties:** The Q&T process ensures uniform properties, minimizing the strength gradient in thick plates. * **Formability:** Limited cold formability due to high strength. Hot forming is possible but must be followed by re-quenching and tempering. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section II, Part D** with allowable stresses for both elevated and low-temperature design. **Disclaimer:** This datasheet provides general information on **ASTM A302 Grade C / SA-302 Grade C**. For procurement, specify the complete standard, grade (C), and required supplementary requirements (especially impact testing temperature and energy). **Design must be based on ASME BPVC allowable stress values.** Fabrication is complex and must be performed under a quality system compliant with codes like ASME Section VIII. Welding Procedure Specifications (WPS) must be qualified per ASME Section IX on representative material, including any required PWHT cycles. Material selection and all thermal processes must be approved by a qualified engineer or inspector familiar with Q&T alloy steels. -:- For detailed product information, please contact sales. -: ASTM A302 Steel, grade C Specification Dimensions Size： Diameter 20-1000 mm Length <4696 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. -: ASTM A302 Steel, grade C Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A302 Steel Rod, grade C -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A302 Steel Rod, grade C -:- For detailed product information, please contact sales. -:

Packing of ASTM A302 Steel Rod, grade C -:- 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 Rod 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 1167 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