ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410)

ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410) Product Information -:- For detailed product information, please contact sales. -: ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A178 C 0.2C Silicon-Killed Steel Tubes for Boilers and Heat Exchangers (STB 410) Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A178 C / STB 410 Silicon-Killed Steel Tubes for Boilers and Heat Exchangers** **Product Overview** ASTM A178 C, commercially designated as **STB 410**, is a medium-carbon, **silicon-killed** steel tube specifically engineered for high-temperature service in boilers and heat exchangers. The silicon-killed deoxidation process ensures a homogeneous, sound microstructure with controlled grain size, enhancing the tube's strength, creep resistance, and weldability. This grade is designed to operate reliably under elevated pressure and temperature conditions, offering a robust balance of mechanical strength and formability for critical heat transfer applications. It is a standard material for generating, superheating, and reheating tubes in various thermal power systems. **Key International Standards** * **Primary Standard:** **ASTM A178 / A178M** - Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes. * **Governing Specification:** This product conforms to the requirements for **Grade C** within ASTM A178. * **Commercial Designation:** Commonly referred to as **STB 410** under the **JIS G 3461** (Japanese Industrial Standard) for carbon steel boiler and heat exchanger tubes. * **Related Standards:** Also aligns with specifications such as **EN 10216-2 P235GH** and **DIN 17175 St 45.8/III** in terms of application and performance. * **Heat Treatment:** Typically supplied in the **as-welded** or **normalized** condition, depending on the manufacturing process and required properties. **Chemical Composition (Weight % - ASTM A178 Grade C Requirements)** The medium carbon content and silicon killing are key to its performance. | Element | ASTM A178 Grade C Requirement | Typical Range / Aim | | :--- | :--- | :--- | | **Carbon (C)** | 0.15 - 0.25% | 0.18 - 0.23% | | **Manganese (Mn)** | 0.55 - 0.90% | 0.60 - 0.85% | | **Phosphorus (P)** | 0.035% max | ≤ 0.025% | | **Sulfur (S)** | 0.035% max | ≤ 0.020% | | **Silicon (Si)** | **0.10% min (for killed steel)** | 0.15 - 0.35% *(Key deoxidizer)* | | **Residual Elements** | -- | Low levels of Cu, Ni, Cr, Mo, V typically present. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A178 Grade C) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 56 ksi (385 MPa) min | 60 - 75 ksi (414 - 517 MPa) | | **Yield Strength (0.2% Offset)** | 37 ksi (255 MPa) min | 40 - 50 ksi (276 - 345 MPa) | | **Elongation in 2" (Min)** | 30% | 30 - 35% | | **Hardness (HRB)** | Approx. 71 max | Typically 65-75 HRB | | **Maximum Service Temperature** | -- | Up to approximately **450°C (842°F)** for prolonged service. Suitable for superheater sections operating at moderate temperatures. | | **Key Feature** | **Silicon-Killed Homogeneity:** Provides a uniform, fine-grained structure with good high-temperature strength (creep resistance), excellent internal soundness (minimal porosity), and superior weldability compared to rimmed or semi-killed steels. | **Product Applications** ASTM A178 C / STB 410 tubes are a workhorse material in thermal energy systems, specified for applications requiring reliable performance under internal pressure and heat. * **Boiler Tubes:** Water-wall tubes, generating tubes, and risers in industrial and utility boilers. * **Superheater & Reheater Tubes:** For sections operating at elevated but not extreme temperatures (e.g., primary superheaters). * **Heat Exchanger Tubes:** For shell-and-tube heat exchangers, economizers, and other pressure vessels in power plants, refineries, and chemical plants. * **Fired Heater Tubes:** In refinery and petrochemical process heaters. * **General High-Temperature/Pressure Piping:** For steam and hot water service within its temperature limits. **Advantages & Fabrication Notes** * **Excellent Weldability:** The silicon-killed, medium-carbon steel composition allows for good weldability using common processes (SMAW, GTAW, GMAW). Post-weld heat treatment (PWHT) is often recommended for heavy sections or severe service to relieve stresses. * **Good Formability & Bendability:** Can be cold bent with appropriate bending radii, making it suitable for constructing complex boiler and heat exchanger bundles. * **Superior High-Temperature Properties:** Offers better creep strength and oxidation resistance than lower-carbon boiler tubes (e.g., ASTM A178 Grade A), making it suitable for more demanding duty. * **Cost-Effectiveness:** Provides a reliable, cost-efficient solution for a wide range of medium-temperature boiler and heat exchanger applications without the need for more expensive alloy steels. * **Inspection:** Tubes are typically subjected to non-destructive testing (NDT) such as hydrostatic testing, eddy current testing, or ultrasonic testing to ensure integrity. **Disclaimer:** This datasheet describes the generic specifications for **ASTM A178 Grade C / STB 410** tubes. For procurement, it is essential to reference the complete standard (ASTM A178/A178M) and specify the grade (C), dimensions, heat treatment condition (if required), and any supplementary testing (e.g., flattening test, flaring test, hydrostatic test pressure). Always consult the manufacturer's data sheets and applicable pressure vessel codes (ASME BPVC, etc.) for design and fabrication guidelines specific to the intended service conditions, including temperature and pressure limits. Material selection must be validated by a qualified engineer for the specific application. -:- For detailed product information, please contact sales. -: ASTM A178 C 0.2C Silicon-Killed Steel Tubes for Boilers and Heat Exchangers (STB 410) Specification Dimensions Size： Diameter 20-1000 mm Length <4693 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 A178 C 0.2C Silicon-Killed Steel Tubes for Boilers and Heat Exchangers (STB 410) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410) -:- For detailed product information, please contact sales. -:

Packing of ASTM A178 C 0.2C Silicon-Killed Steel Wire Tubes for Boilers and Heat Exchangers (STB 410) -:- 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 Wire 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 1164 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