SA36 steel is a general-purpose carbon structural steel specification defined by ASTM International, widely used for riveted, bolted, or welded construction of bridges, buildings, and general structural purposes.
The "SA" prefix specifically indicates that the material conforms to the ASME Boiler and Pressure Vessel Code (BPVC) version of the ASTM specification, meaning it is accepted for use in pressure vessel and boiler construction. For all practical mechanical and chemical properties, SA36 is identical to the more commonly referenced ASTM A36 steel.
Key Characteristics Of SA36/A36:
Type: Low-carbon, mild steel.
Yield Strength: Minimum 36,000 psi (250 MPa).
Tensile Strength: 58,000 - 80,000 psi (400 - 550 MPa).
Key Feature: It is a "strength-only" grade. Unlike many European grades (e.g., S355J2), it has no mandatory impact toughness (Charpy) requirements in its base specification.
Weldability: Excellent, due to its low carbon content.
Common Forms: Plates, bars, structural shapes (beams, angles, channels).
Typical Applications:
Building frames and industrial structures.
Base plates, machine parts, and brackets.
Non-critical components of bridges.
General fabrication where high strength or low-temperature toughness is not a primary concern.
Components in ASME-coded pressure vessels (when specified as SA36).
►Chemical composition for A36 carbon steel angles (Heat Analysis Max%)
| Main chemical elements composition of A36 | ||||||
| Thickness(mm) | C | Si | Mn | P | S | Cu (Min.) Cooper steel |
| T≤20 | 0.25 | 0.40 | ... | 0.04 | 0.05 | 0.20 |
| 20<T≤40 | 0.80-1.20 | |||||
| 40<T≤65 | 0.26 | 0.15-0.40 | ||||
| 65<T≤100 | 0.27 | 0.85-1.20 | ||||
| 100<T | 0.29 | |||||
The price of SA36/A36 steel, like all commodity steels, is influenced by a hierarchy of factors from global markets to specific transaction details. Here are the key drivers:
1. Macro & Global Market Factors (The "Base Price" Foundation)
These set the underlying price floor for all hot-rolled carbon steel.
Raw Material Costs: The prices of iron ore, coking coal, and scrap metal are the primary inputs. High scrap prices can also make electric-arc furnace (EAF) production more expensive.
Global Supply & Demand: Strong industrial and construction activity in major economies (US, China, EU) increases demand and pushes prices up. Economic slowdowns or oversupply lead to price drops.
Energy Prices: Steelmaking is extremely energy-intensive. High costs for natural gas and electricity directly raise production costs, especially for integrated mills.
Trade Policies & Tariffs: Section 232 tariffs in the US, anti-dumping duties, and import quotas protect domestic markets and can keep US prices higher than global benchmarks. Changes in these policies cause volatility.
Freight & Logistics: Costs for shipping raw materials to mills and finished products to distributors. High trucking rates or bulk freight costs add to the final price.
2. Product-Specific Factors (The "A36 Commodity" Layer)
SA36/A36 is a high-volume commodity with minimal quality premiums.
Grade Simplicity: As a basic low-carbon steel with no mandatory impact toughness or special treatments, its production cost is lower than that of high-strength or alloy steels (e.g., A572, A588).
High Volume & Competition: It is the most widely produced and consumed structural steel in North America. High availability and competition among mills and service centers typically keep its premium over the base hot-rolled coil (HRC) price relatively small.
"SA" vs. "A" Prefix: SA36 (for ASME code work) may carry a slight premium over A36 due to more stringent documentation and traceability requirements, but the material itself is identical.
3. Purchase & Transaction Factors (Your Final Quote)
These variables cause significant price differences between buyers.
Order Volume: The single biggest factor. Full truckloads (TL) or mill-direct orders of hundreds of tons receive major discounts versus small will-call purchases from a service center.
Product Form & Processing:
Form: Price per pound varies between hot-rolled plate, structural shapes (beams, channels, angles), bars, and sheets. Complex rolling for shapes often costs more.
Size/Thickness: Very thin or very thick material outside standard inventory ranges may carry a premium. Standard sizes (e.g., W-beams) are most competitive.
Processing: Buying pre-cut, drilled, blasted, or primed steel adds significant cost over raw, mill-grade material.