Editorial Technical Reference

Steel Ingots

This page explains how Steel Ingots is classified within Basic Metal Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Semi-finished steel products cast into standardized shapes for further processing.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Steel Ingots

Definition
Steel ingots are intermediate products formed by pouring molten steel into molds where it solidifies into standardized shapes, typically rectangular or square cross-sections. They serve as the primary input material for subsequent rolling, forging, or extrusion processes in steel manufacturing. The ingots are produced from molten steel sourced from basic oxygen furnaces or electric arc furnaces, with controlled cooling and solidification to achieve desired metallurgical properties. Common grades include ASTM A36, A572 Gr.50, 1045, 4140, 316L, and 304L, each with distinct mechanical properties. Carbon content typically ranges from 0.05% to 1.20%, influencing formability and hardness. Standard dimensions vary from 100x100x500 mm to 500x500x2000 mm, with tolerances of ±5 mm. Ingot weight ranges from 0.5 to 10 tons. Surface temperature at delivery is typically 20–60 °C, and surface quality must be free of cracks, scabs, or laps, with defects not exceeding 2 mm depth. Internal soundness may be verified via ultrasonic testing per ASTM A388, with maximum indication size of 3 mm. Chemical composition limits include phosphorus ≤0.04%, sulfur ≤0.05%, and copper ≤0.20%. Delivery conditions can be as-cast, annealed, or normalized. Pouring temperature is typically 1520–1560 °C, mold preheat temperature 80–120 °C, cooling rate after solidification 0.5–2.0 °C/min, and storage temperature before dispatch 20–60 °C. These parameters are critical for achieving the required metallurgical properties and avoiding defects. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
Molten steel from basic oxygen furnaces or electric arc furnaces is poured into ingot molds where controlled cooling and solidification occurs. The process involves deoxidation, alloying, and temperature control to achieve desired metallurgical properties before the solidified steel is stripped from molds for further processing. Key parameters include pouring temperature (1520–1560 °C), mold preheat temperature (80–120 °C), and cooling rate after solidification (0.5–2.0 °C/min). These factors influence the internal structure, surface quality, and mechanical properties of the ingot. After solidification, ingots are stored at 20–60 °C before dispatch to prevent oxidation or condensation. The ingots are then used as input for rolling, forging, or extrusion.
Common Materials
Iron Ore, Scrap Steel, Alloying Elements
Technical Parameters
ParameterTypical rangeNotes & selection driver
Alloy GradeRequiredASTM A36, A572 Gr.50, 1045, 4140, 316L, 304L gradeASTM A36, A572 Gr.50, 1045, 4140, 316L, 304L — Specify grade per application; each grade has distinct mechanical properties.ASTM A36 · ASTM A572
Carbon ContentRequired0.05–1.20 %0.05–1.20 — Low carbon (<0.15%) for formability, high carbon (>0.5%) for hardness.ASTM E1019
DimensionsRequired100x100x500–500x500x2000 mm100x100x500 to 500x500x2000 — Standard ingot sizes; custom sizes available on request.ASTM A29
Surface Temperature20–60 °C20–60 — Temperature at delivery; higher temperatures indicate insufficient cooling.
WeightRequired0.5–10 ton0.5–10 — Typical ingot weight; larger ingots may require special handling.
Tolerance on Dimensions±5 mm±5 — Tighter tolerances available at extra cost.ASTM A29
Surface QualityNo cracks, scabs, or laps; surface defects ≤2 mm depth visualNo cracks, scabs, or laps; surface defects ≤2 mm depth — Inspect per ASTM A29; defects may be removed by chipping or grinding.ASTM A29
Internal SoundnessUltrasonic testing per ASTM A388; max indication size 3 mmUltrasonic testing per ASTM A388; max indication size 3 mm — For critical applications; specify if required.ASTM A388
Chemical Composition LimitsP ≤0.04, S ≤0.05, Cu ≤0.20 %P ≤0.04, S ≤0.05, Cu ≤0.20 — Residual elements controlled to avoid hot shortness and surface defects.ASTM A29
Delivery ConditionAs-cast, annealed, or normalized conditionAs-cast, annealed, or normalized — Specify heat treatment if required for subsequent processing.
Pouring temperature1520–1560 °C1520–1560 °C — Outside this window: Too low: cold shuts and misruns; too high: excessive oxidation and gas pickup.
Mold preheat temperature80–120 °C80–120 °C — Outside this window: Below 80°C: thermal shock and cracking; above 120°C: mold distortion and sticking.
Cooling rate after solidification0.5–2.0 °C/min0.5–2.0 °C/min — Outside this window: Too fast: internal stresses and cracking; too slow: segregation and coarse grain.
Storage temperature before dispatch20–60 °C20–60 °C — Outside this window: Above 60°C: risk of oxidation and scale; below 20°C: condensation and rusting.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Ingot Body Part
    Main structural mass of solidified steel
    Material: Carbon steel or alloy steel
  • Hot Top Part
    Insulated section to minimize shrinkage cavities
    Material: Refractory insulation material
  • Surface Scale Part
    Oxide layer formed during cooling
    Material: Iron oxides
  • Identification Markings Part
    Permanent identification of grade and batch
    Material: Painted or stamped markings

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steel Ingots.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

What Decides the Award
  • What steel grade and carbon content range do you require?
  • What ingot weight and dimensions are needed for your downstream process?
  • What surface quality and internal soundness standards must be met?
  • What is the required delivery condition (as-cast, annealed, normalized)?
  • What is the acceptable tolerance on dimensions and weight?
  • What is the required production capacity (tonnes per month)?
  • What is the maximum allowable content of residual elements (P, S, Cu)?
Failure Modes & Inspection
  • Surface cracks
    Check: Visual inspection and dye penetrant testing per ASTM E165
  • Internal porosity or shrinkage
    Check: Ultrasonic testing per ASTM A388
  • Segregation (alloying elements concentrated)
    Check: Chemical analysis from multiple locations per ASTM E1019
  • Dimensional deviations
    Check: Dimensional measurement with calipers or CMM
  • Excessive scale or oxidation
    Check: Visual inspection and weight loss measurement

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Cyclic heating and cooling during casting and rolling processes leading to stress concentration and crack initiation at grain boundaries
Surface oxidation and scaling
Cause: Exposure to high temperatures in furnace environments without proper atmosphere control, resulting in material loss and surface degradation
Maintenance Indicators
  • Visible surface cracks or fissures on ingot surfaces during inspection
  • Abnormal popping or cracking sounds during cooling processes indicating internal stress fractures
Engineering Tips
  • Implement controlled cooling protocols with gradual temperature reduction to minimize thermal stress gradients
  • Apply protective coatings or controlled atmosphere environments during high-temperature processing to prevent surface oxidation

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A36/A36M - Standard Specification for Carbon Structural Steel ISO 630-1 - Structural steels - Part 1: General technical delivery conditions for hot-rolled products EN 10025-2 - Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels

Quoted from the published standard.

Manufacturing Precision
  • Length: +/- 25mm for ingots up to 6m
  • Cross-sectional dimensions: +/- 2% of nominal size
Quality Inspection
  • Chemical Composition Analysis (Spectrometry)
  • Ultrasonic Testing for internal defects

Manufacturers of Steel Ingots

5 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

RMC Foundry (Qingdao Rinborn Machinery Co., Ltd)
Qingdao, Shandong, CN
Founded 1999
ISO 9001
Managed by the manufacturer
Stated by the company
Dandong Foundry (Liaoning Borui Machinery Co., Ltd)
Dandong, Liaoning, CN
ISO 9001
Also makes: Ductile Iron Casting, Manhole Cover, Water Pump and 5 more
Stated by the company · profile compiled by CNFX from public sources
VIGOR INNO-TECH Limited
Shaanxi, CN
Founded 2007
Listed on the company's own website · profile compiled by CNFX from public sources
Wuxi Junteng Fanghu Alloy Casting Co., Ltd.
Jiangsu, CN
Founded 2006
ISO9001 ISO14001
Listed on the company's own website · profile compiled by CNFX from public sources
Epowermetals
Zhejiang, CN
Also makes: Butterfly Valve, Heat Exchanger, Steel Forging and 7 more
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
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Manufacturing capability
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Inspection readiness
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Supply Chain Commonly Integrated Components

Infrared Pyrometer

A non-contact temperature measurement device that detects infrared radiation emitted by objects to determine their surface temperature.

Explore Specs →
Gas Control System

A system that regulates and controls the flow, pressure, and composition of gases used in molten metal degassing processes.

Explore Specs →
Refractory Lined Ladle

A steel ladle with an interior refractory lining designed to withstand high temperatures and contain molten metal during transfer operations.

Explore Specs →
Reagent Injection System

A system designed to precisely inject desulfurization reagents into molten metal within a desulfurization reactor

Explore Specs →

Frequently Asked Questions

What are steel ingots used for?

Steel ingots are intermediate products used as input material for rolling, forging, or extrusion processes to produce finished steel products such as bars, plates, and structural sections.

What grades are available for steel ingots?

Common grades include ASTM A36, A572 Gr.50, 1045, 4140, 316L, and 304L. Each grade has distinct mechanical properties; the appropriate grade depends on the application.

What are typical dimensions and weights of steel ingots?

Standard dimensions range from 100x100x500 mm to 500x500x2000 mm, with tolerances of ±5 mm. Ingot weight typically ranges from 0.5 to 10 tons.

How is the quality of steel ingots verified?

Quality is verified through surface inspection per ASTM A29, ultrasonic testing per ASTM A388 for internal soundness, and chemical analysis per ASTM E1019. Always confirm specific requirements with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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