ASTM A615 Grade 40 Steel Rebar

Overview of ASTM A615 Grade 40 Steel Rebar

ASTM A615 Grade 40 is a standard low-strength reinforcing steel rebar specified under ASTM A615/A615M standard, primarily used for light-duty concrete reinforcement applications where lower structural demands exist. Grade 40 represents reinforcement bar with a minimum yield strength of 40,000 psi (280 MPa) and minimum tensile strength of 60,000 psi (420 MPa). The grade designation ‘Grade 40’ refers to the minimum yield strength in ksi (kilopounds per square inch), distinguishing it from the more commonly used Grade 60 (60 ksi yield) and higher-strength Grade 75/80 variants.

A615 Grade 40 rebar features the same standard ASTM rib pattern with transverse ribs and longitudinal ribs designed for mechanical bond with concrete as higher grades. The grade is manufactured from billet steel with controlled chemical composition meeting ASTM A615 carbon and manganese requirements. While Grade 60 has become the predominant reinforcement grade in North America, Grade 40 remains specified for residential foundation work, sidewalks, driveways, light-duty slabs, and non-structural applications where the lower yield strength is adequate and provides cost advantages. Grade 40 is also used in developing markets and regions where construction codes permit lower-strength reinforcement for specific building types.

Key Features and Manufacturing Standards

ASTM A615 Grade 40 steel rebar is produced through continuous hot rolling process from billet feedstock, with controlled cooling to achieve the specified mechanical properties. Due to the lower strength requirements compared to Grade 60, Grade 40 can be manufactured with less stringent cooling control and simpler chemical composition. The rib pattern is formed during the final rolling pass using grooved rolls, creating standardized transverse and longitudinal ribs meeting ASTM dimensional requirements for rib spacing, rib height, and rib gap identical to higher grades.

The rebar is supplied in metric bar designations from #3 (10mm) through #18 (57mm), though sizes #3 through #11 are most commonly produced in Grade 40, as larger sizes are typically specified as Grade 60 for structural applications. The most common project sizes for Grade 40 are #3 (10mm), #4 (13mm), #5 (16mm), and #6 (19mm) used in residential and light commercial work. Standard mill lengths are 20 feet (6.1m), 30 feet (9.1m), 40 feet (12.2m), and 60 feet (18.3m). Each bar is marked at intervals not exceeding 5 feet with mill identification, bar size designation, type symbol (S for A615), and grade marking (40 or single longitudinal line) for identification throughout the construction supply chain.

Main Applications of A615 Grade 40 Steel Rebar

ASTM A615 Grade 40 steel rebar is primarily used for light-duty and residential concrete reinforcement applications where structural demands are lower and building codes permit lower-strength reinforcement. Residential construction applications include residential foundation footings, foundation walls for single-family homes, basement floor slabs, garage slabs, patio slabs, sidewalk reinforcement, driveway concrete, residential retaining walls (low height), steps and stoops, and light-duty residential applications in subdivisions and housing developments.

Commercial and municipal applications include parking lot paving reinforcement, pedestrian sidewalks and walkways, plaza decks, light-duty warehouse floor slabs, commercial driveways and access roads, curb and gutter construction, median barriers, landscaping walls, non-structural partition walls, and architectural features where reinforcement is required for crack control rather than structural support. Agricultural and rural applications include barn foundations, equipment pad slabs, livestock facility floors, irrigation channel linings, farm access roads, and rural infrastructure projects. Grade 40 is also commonly used in developing markets and international regions where local building codes permit lower-grade reinforcement for residential and light commercial construction, providing cost-effective reinforcement solutions for projects with lower structural performance requirements.

Why Choose Us for ASTM A615 Grade 40 Steel Rebar

Shandong Tanglu Metal Material Co., Ltd. supplies ASTM A615 Grade 40 steel rebar manufactured to American specification standards from major Chinese steel mills with comprehensive quality control systems ensuring compliance with ASTM A615/A615M requirements. Every production lot undergoes mandatory chemical composition analysis, mechanical property testing including yield strength, tensile strength, elongation, and bend test verification, and dimensional inspection per ASTM A615/A615M latest revision, ensuring full compliance with the lower-strength grade specifications.

We offer comprehensive bar size range from #3 through #11 in standard mill lengths and custom cut-to-length, with flexible packaging configurations optimized for both 20FT FCL and 40FT FCL container loading. With monthly export capacity of 15,000 tons of A615 rebar (all grades) and established relationships with construction supply distributors, residential contractors, and rebar fabricators in over 30 countries, we support both project-specific orders and ongoing distributor inventory supply for residential and light commercial markets. Each shipment includes original mill test certificate (MTC) conforming to EN 10204 3.1 standard and meeting ASTM reporting requirements, with EN 10204 3.2 and third-party inspection (SGS, BV, ABS, DNV, LR) available for projects requiring enhanced documentation. Our Grade 40 rebar provides cost-effective reinforcement solutions for applications where lower yield strength is code-compliant and structurally adequate.