Low Temperature Carbon Hot Rolled Steel Sheet/Plate

Low temperature carbon hot rolled steel sheets/plates are carbon structural steel products produced via hot rolling, designed to exhibit excellent low-temperature performance (such as impact toughness) to prevent brittle fracture in cold environments. Below is a detailed overview:

I. Material Characteristics and Standards

Core Properties

Low-Temperature Toughness: Through optimized alloy composition (e.g., controlled carbon content, trace element additions) and rolling processes, these steels maintain sufficient impact toughness (e.g., Charpy impact energy ≥27J) at low temperatures (e.g., -20°C, -40°C), avoiding brittle failure.

Hot Rolling Advantages: High-temperature rolling refines the steel's microstructure, enhancing strength and workability while offering lower costs compared to cold-rolled steel.

Common Standards

Chinese Standards:

GB/T 700-2006 Carbon Structural Steel: Grades like Q235C/D and Q355C/D (C/D denote impact test temperatures: C = 0°C, D = -20°C).

GB/T 1591-2018 High-Strength Low-Alloy Structural Steel: Some carbon steel-derived grades also meet low-temperature requirements.

International Standards:

ASTM A36/A36M (USA): Used for general structures; low-temperature performance is achieved via supplementary requirements (e.g., impact testing).

EN 10025-2:2004 (Europe): Grades like S235JR, S355J2, where J2 specifies impact toughness at -20°C.

 

 

II. Chemical Composition

Take Chinese Q235D as an example (typical values; refer to standards for specifics):

 

Element	Content (%)	Role
C	≤0.17	Reduces carbon content to improve toughness and minimize low-temperature embrittlement.
Mn	0.30–0.80	Enhances strength; moderate manganese improves toughness.
Si	≤0.35	Acts as a deoxidizer; moderate levels boost strength, but excess reduces toughness.
P/S	≤0.030	Strict control of phosphorus (P) and sulfur (S) minimizes cold and hot shortness tendencies.

 

 

 

 

 

 

 

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