ASTM A519 SAE4140 Seamless Alloy Steel Pipe (20mm-140mm) -
High-Strength Industrial Tubing
ASTM A519 SAE4140 steel pipe is a high-performance medium-carbon
chromium-molybdenum alloy seamless pipe, produced in strict
accordance with the ASTM A519 standard. With an outer diameter
ranging from 20mm to 140mm, this SAE4140 alloy steel pipe boasts
excellent strength, toughness, hardenability and wear resistance,
making it widely applied in mechanical engineering, automotive
manufacturing, oil and gas drilling, aerospace and high-pressure
equipment fields. As a professional foreign trade supplier, we
provide high-quality ASTM A519 SAE4140 steel pipes with stable
performance, precise dimensions and reliable quality, fully meeting
the strict requirements of international industrial applications
and export standards for ASTM A519 SAE4140 products.
Product Core Specifications
Our ASTM A519 SAE4140 steel pipe is made of high-purity SAE4140
alloy steel, a typical chromium-molybdenum low-alloy high-strength
material that complies with ASTM A519 standard. The product covers
an outer diameter of 20mm to 140mm, which can be customized
according to customer needs, supporting small-batch and large-batch
orders. This SAE4140 steel pipe is easy to process, weld and heat
treat, and can be adjusted through quenching and tempering
processes to meet the performance requirements of different working
conditions for ASTM A519 products.
- Executive Standard: ASTM A519 (Seamless Carbon and Alloy Steel Mechanical Tubing)
- Material: SAE4140 (medium-carbon chromium-molybdenum alloy steel, UNS
G41400, compliant with ASTM A519)
- Outer Diameter: 20mm - 140mm (customizable for special specifications of ASTM
A519 SAE4140 steel pipe)
- Product Type: Seamless Alloy Steel Pipe (ASTM A519 SAE4140 grade)
- Core Features: High strength, good toughness, excellent hardenability, wear
resistance, high-temperature resistance and good machinability (key
advantages of SAE4140 under ASTM A519 standard)
- Application Fields: Mechanical gears, automotive transmission shafts, oil drilling
tools, high-pressure hydraulic pipelines, aerospace components,
mold manufacturing and other high-load, high-stress working
scenarios suitable for ASTM A519 SAE4140 steel pipe
Chemical Composition of SAE4140 (ASTM A519 Standard)
The chemical composition of ASTM A519 SAE4140 steel pipe is
strictly controlled in accordance with ASTM A519 international
standards, ensuring the stability and comprehensiveness of SAE4140
product performance. The specific mass fraction is shown in the
following table:
Chemical Element | Mass Fraction (%) (SAE4140, ASTM A519 Standard) |
Carbon (C) | 0.38 ~ 0.43 |
Silicon (Si) | 0.15 ~ 0.35 |
Manganese (Mn) | 0.75 ~ 1.00 |
Phosphorus (P) | ≤ 0.035 |
Sulfur (S) | ≤ 0.040 |
Chromium (Cr) | 0.80 ~ 1.10 |
Molybdenum (Mo) | 0.15 ~ 0.25 |
Nickel (Ni) | ≤ 0.25 |
Copper (Cu) | ≤ 0.30 |
Mechanical Properties of ASTM A519 SAE4140 Steel Pipe (After
Quenching & Tempering)
After quenching and tempering treatment, the ASTM A519 SAE4140
steel pipe has excellent mechanical properties, which can meet the
load-bearing requirements of various harsh working conditions for
SAE4140 products under ASTM A519 standard. The specific indicators
are as follows:
Mechanical Index | Specification (ASTM A519 Standard for SAE4140 Steel Pipe) |
Tensile Strength (σb) | ≥ 930 MPa (up to 1130 MPa after optimization for ASTM A519 SAE4140) |
Yield Strength (σs) | ≥ 730 MPa (up to 965 MPa after optimization for ASTM A519 SAE4140) |
Elongation (δ5) | ≥ 12 % |
Reduction of Area (ψ) | ≥ 50 % |
Impact Energy (Akv) | ≥ 63 J |
Hardness (HB) | ≤ 230 HB (annealed state); 40~50 HRC (quenched & tempered state
for ASTM A519 SAE4140) |
Chemical Composition Comparison: SAE4140 vs Domestic Alternative
Material (42CrMo)
ASTM A519 SAE4140 steel pipe can be replaced by domestic 42CrMo
steel in most industrial scenarios. The two materials are both
chromium-molybdenum alloy steels with similar chemical compositions
and mechanical properties, and the specific comparison (based on
ASTM A519 standard for SAE4140) is shown in the table below:
Chemical Element | SAE4140 (ASTM A519) (%) | Domestic 42CrMo (%) |
Carbon (C) | 0.38 ~ 0.43 | 0.38 ~ 0.45 |
Silicon (Si) | 0.15 ~ 0.35 | 0.17 ~ 0.37 |
Manganese (Mn) | 0.75 ~ 1.00 | 0.50 ~ 0.80 |
Phosphorus (P) | ≤ 0.035 | ≤ 0.030 |
Sulfur (S) | ≤ 0.040 | ≤ 0.030 |
Chromium (Cr) | 0.80 ~ 1.10 | 0.90 ~ 1.20 |
Molybdenum (Mo) | 0.15 ~ 0.25 | 0.15 ~ 0.25 |
Product Advantages (For International Trade)
- Strictly Complies with ASTM A519 Standard: All ASTM A519 SAE4140
steel pipes are produced and tested in accordance with
international ASTM A519 standards, with complete test reports and
quality certificates, ensuring smooth customs clearance for export
of SAE4140 products.
- High-Quality SAE4140 Material: The addition of chromium and
molybdenum elements enhances the strength, toughness and
hardenability of the SAE4140 steel pipe, which can withstand high
temperature, high pressure and frequent mechanical wear, and has a
long service life, fully meeting ASTM A519 requirements.
- Wide Size Range: The outer diameter ranges from 20mm to 140mm,
covering most industrial application needs of ASTM A519 SAE4140
steel pipe, and supports customized processing of special
specifications to meet the diverse needs of overseas customers.
- Excellent Processability: The ASTM A519 SAE4140 steel pipe is easy
to cut, weld, quench and temper, reducing the processing difficulty
for customers and improving production efficiency of SAE4140
components.
- Cost-Effective Alternative: Domestic 42CrMo can be used as a
substitute for SAE4140 (ASTM A519), which helps customers reduce
procurement costs while ensuring that the performance meets the
ASTM A519 standard and application requirements.
Application Scenarios
ASTM A519 SAE4140 steel pipe is widely used in various
international industrial fields due to its excellent comprehensive
performance, including but not limited to: automotive transmission
shafts, engine components, high-pressure hydraulic pipelines made
of SAE4140, oil drilling tools, aerospace structural parts,
mechanical gears, mold cores and high-load bearings. This ASTM A519
SAE4140 steel pipe has been exported to many countries and regions,
and has won unanimous praise from customers for its stable quality
and reliable performance that complies with ASTM A519 standard.
