Why Buyers Route Their AISI 4140 Round Bar Enquiry To Ganpat Industrial Corporation?
Heat-Traceable Cr-Mo Bar
Every AISI 4140 Round Bar ships with a heat number linked back to the mill cast
NACE-Route Heat Treatment
Normalised, quenched & tempered furnace cycles logged for sour service orders
Quote Inside 24 Hours
Send diameter, length and condition before 6 PM IST for next-morning pricing
Rack Stock, Fast Dispatch
Common diameters in black, bright and polished finish move within 5 working days
Zero Rejection Cost
Chemistry, hardness and dimensional checks cleared before the bundle is strapped
AISI 4140 Round Bar Aspects
- 1Material Basis: Chromium-Molybdenum Low Alloy Steel • UNS G41400 • Werkstoff 1.7225
- 2Governing Standards: ASTM A29 / A29M • ASTM A322 (Hot-Wrought) • ASTM A331 (Cold-Finished)
- 3Size Range: Round Bar 5 mm to 500 mm dia • Square, Hex & Flat On Request • Forged Blocks Above 500 mm On Order
- 4Alloying: 0.80-1.10% Chromium • 0.15-0.25% Molybdenum • Through-Hardening Medium Carbon Base
- 5Equivalents: DIN/EN 1.7225 42CrMo4 • JIS G4105 SCM440 • GB/T 3077 42CrMo • BS 970 709M40 (EN19)
- 6Forms Supplied: Round, Square, Hex, Flat, Threaded, Forged & Bright Bar Ex-Stock Mumbai
Mumbai works desk • WhatsApp +91 85912 64209 • Driven pricing on every size list
Ganpat Industrial Corporation has forged and stocked alloy bar in Mumbai since 1997. AISI 4140 Round Bar is a 1% chromium-molybdenum, medium-carbon engineering steel. It is prized for its through-hardening response and torsional strength. We hold ASTM A29 4140 Rod and Carbon Steel 4140 Round Bars. We stock ASTM A322 hot-wrought and ASTM A331 cold-finished grades. Sections include round, square, hex, flat and threaded bar. Bars are supplied black, normalised, or quenched and tempered on request. UNS G41400 heat traceability carries through on every despatch. Every despatch includes an EN 10204 3.1 mill test certificate. We provide 3.2 certificates on TPI-witnessed orders. We regularly ship this bar to Vadodara, Chennai and Kandla. We export to Dubai, Jebel Ali, Rotterdam and Houston.
Mumbai · Chromium-Molybdenum Through-Hardening Bar Stockist & Exporter
Alloy Steel 4140 Round Bar Engineered for High Strength & Toughness
Source Quenched & Tempered Alloy Steel 4140 Round Bar in Any Size, Direct from the Mill. Ganpat Industrial delivers AISI 4140 Round Bar across India at competitive, factory-linked rates. Our inventory spans ASTM A29 4140 Rod from 5 mm through 500 mm, backed by complete EN 10204 3.1 mill certification, with larger diameters available via custom forging.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
UNS Designation
G41400
DIN/Werkstoff 1.7225
Governing Standard
ASTM A29 / A322
Hot-wrought alloy steel bar
Q&T Tensile Band
850 – 1000 MPa
Quenched & tempered condition
Round Bar Range
5 – 500 mm
Black, normalised & bright drawn
NACE Approved ASTM A29 4140 Rod Supplier in India as per Custom Specification
Specification Of AISI 4140 Round Bar
An AISI 4140 Round Bar Supplier in India ships bars with matching chemistry and paperwork.
4140 Round Bar Material Basis
- Chromium-Molybdenum Low Alloy Steel
- Medium Carbon, Through-Hardening
- UNS G41400
- Carbon Steel AISI 4140 Bars On Rack
Governing Bar Standards
- ASTM A29 / A29M 4140
- ASTM A322 Hot-Wrought Grade
- ASTM A331 Cold-Finished Grade
- DIN 1.7225 Rods / EN 10083-3
AISI 4140 Round Bar Size Range
- 5mm to 500mm Diameter
- 3/16″ to 20″ equivalent diameter
- Custom lengths cut-to-size
- Forged blocks above 500mm on order
Bar Form & Section
- Alloy Steel AISI 4140 Round Bars
- AISI 4140 Low Carbon Steel Square Bar
- SCM440 Rectangular Bar
- UNS G41400 Hexagonal Bars
Delivery Condition
- Black / As-Rolled
- Normalised, 840-880°C
- Quenched & Tempered On Request
- Alloy Steel AISI 4140 Cold Drawn Round Bar
Production Route
- Hot Rolled / Forged From Billet
- Cold Drawn For Bright Bar
- Normalising / Quench & Temper
- Centreless Ground To Size
Testing Offered
- PMI Spectro Analysis
- Hardness & Tensile Test
- Ultrasonic Testing (UT)
- Third Party Inspection
Matching Products
- 4140 Alloy Steel Threaded Bar
- Carbon Steel 4140 Forged Bar Flanges & Fittings
- 4140 Fasteners & Studs
- 4130 / 4340 Alloy Steel Bar
Packing
- Bundled With Grade Tags
- VCI Wrap For Bright Bar
- Fumigated Wooden Crates
- Export Seaworthy Packing
Types Of Carbon Steel AISI 4140 Bars We Supply
This AISI 4140 Round Bar Manufacturer in India controls roll pass and heat treatment.
AISI 4140 Round Bar
Round Section
AISI 4140 Square Bar
Square Section
42CrMo4 Steel Hex Bar
Hex Section
Alloy Steel 4140 Flat Bar
Flat Section
AISI 4140 Threaded Bar
Rolled / Cut Thread
4140 AISI Forged Bars
Forged Blank
AISI UNS G41400 Bright Bar
Peeled & Polished
4140 AISI Black Bar
Hot Rolled
Need SAE 4140 Rods Above 300 mm?Mail the diameter and length for large sizes. 4140 AISI Forged Bars are quoted the same day.
Buy Tempered & Quenched Alloy Steel 4140 Round Bar in Custom Sizes at Mill Price
ASTM A29 4140 Rod Size & Dimension Chart
Partner with a stockist quoting exact section and length for AISI 4140 Round Bar.
| Section | Size Range | Typical Length |
|---|---|---|
| ASTM A29 4140 Rod (Round) | 5 mm – 500 mm dia | 1 – 6 metre, custom cut |
| AISI 4140 Low Carbon Steel Square Bar | 10 mm x 10 mm – 200 mm x 200 mm | 1 – 6 metre |
| 42CrMo4 Steel Hex Bar | 10 mm – 100 mm A/F | 1 – 6 metre |
| Alloy Steel 4140 Flat Bar | 10 mm – 150 mm thickness | 1 – 6 metre |
| 4140 AISI Forged Bars / Block | Up to 800 mm block, custom | As drawing |
WNR 1.7225 Hot Rolled Bar Chemical Composition
Composition held against ASTM A322 Grade G41400 heat analysis limits on every cast.
IronFe
Balance
CarbonC
0.38 – 0.43%
ManganeseMn
0.75 – 1.00%
ChromiumCr
0.80 – 1.10%
MolybdenumMo
0.15 – 0.25%
SiliconSi
0.15 – 0.35%
PhosphorusP
0.035% max
SulphurS
0.040% max
Weekly Delivery Of AISI 4140 Round Bar In Below Countries:
| Export to | Continent | Shipping time |
|---|---|---|
 Saudi Arabia |
Asia | 7 Days |
 UAE |
Asia | 5 Days |
 Netherlands |
Europe | 22 Days |
 USA |
North America | 35-45 Days |
SAE 4140 Rod Mechanical Properties
Values Vary With Delivery Condition
These are the numbers an inspector checks against the mill test certificate, by supplied condition.
Annealed Tensile
655 MPa
Approx, per ASM datasheet reference
Annealed Hardness
197 HB Approx.
Good machinability condition
Normalised Tensile
1020 MPa Approx.
870°C normalised, 25.4mm section
Normalised Hardness
302 HB Approx.
Air cooled condition
Q&T Tensile Strength
850 – 1000 MPa
Quenched & tempered band
Q&T Yield Strength
655 MPa Min
0.2% offset, typical Q&T minimum
Elongation
15 – 26%
In 50mm, condition dependent
Q&T Hardness
28 – 34 HRC
Common pre-hardened bar condition
Physical Properties Of Alloy Steel AISI 4140 Round Bars
Reference values a design engineer needs before specifying AISI 4140 Round Bar from an Indian mill.
Density
7.85 g/cm³
0.284 lb/in³
Melting Range
1416 – 1454°C
2580 – 2650°F approx
Modulus Of Elasticity
205 – 210 GPa
At room temperature
Thermal Conductivity
42.6 W/m·K
At ambient temperature
Specific Heat
473 J/kg·K
0-200°C, hardened condition
Coeff. Thermal Expansion
12.2 µm/m·K
20-100°C, oil hardened & tempered
Electrical Resistivity
~220 nΩ·m
At 20°C, hardened condition
Poisson’s Ratio
0.27 – 0.30
Typical for low alloy steel
AISI 4140 Bar Equivalent Grades
One Chemistry, Several Nameplates
AISI 4140 Round Bar reads the same chromium-molybdenum chemistry basis across every national standard.
ASTM / AISI / UNS
- ASTM A29 / A29M Grade 4140
- ASTM A322 (Hot-Wrought)
- ASTM A331 (Cold-Finished) • UNS G41400
DIN / EN / Werkstoff
- DIN / Werkstoff 1.7225
- EN 10083-3 42CrMo4
- DIN 1.7225 Rods, Same UNS Basis
JIS / GB
- JIS G4105 SCM440
- GB/T 3077 42CrMo
- Matched On Chemistry, Not Number
BS / UK Legacy
- BS 970 709M40
- Commonly Called EN19
- Confirm Heat Treatment Band On PO
Nearby ASTM Grades
- AISI 4130 (Lower Carbon)
- AISI 4142 / 4145 (Higher Carbon)
- AISI 4340 (Ni-Cr-Mo Family)
Indian Market Note
- No Single-Number IS Equivalent
- Ordered Directly As 4140 / EN19
- Compared By Chemistry, Confirmed On MTC
NACE MR0175 Sour Service Compliance
Condition And Hardness Decide Acceptance, Not The Grade Name
NACE MR0175 / ISO 15156 permits AISI 4140 for H2S service only within a defined hardness and heat-treatment window.
Normalised & Tempered Route
22 HRC Max
Base Metal, Weld & HAZ
Q&T Route, SSC-Tested
Up To 26-30 HRC
Requires NACE TM0177 Testing
Typical Sour Service Use
Drill Collars, Valve Trim
Confirm Duty Class With Us
Certification Supplied
EN 10204 3.1 / 3.2
NACE Compliance Statement On Request
AISI 4140 Round Bar vs 4130 vs EN19
Buyers often confuse these three Cr-Mo grades. Here is where each one is actually the right call.
AISI 4130 Round Bar
- Lower carbon, 0.28-0.33%
- Easier to weld without preheat cracking risk
- Lower peak Q&T strength than 4140
- Preferred where welding follows machining
AISI 4140 Round Bar
- Higher carbon, 0.38-0.43%, deeper hardenability
- 850-1000 MPa tensile in Q&T condition
- Preheat and low-hydrogen electrodes needed to weld
- Preferred for shafts, gears and high-load bolts
EN19 (BS 970 709M40)
- UK legacy designation, same chemistry family
- Common on drawings from UK-origin OEMs
- Often supplied Q&T to BS 970 tensile bands
- Interchangeable subject to matched heat treatment
AISI 4140 Round Bar
- ASTM/AISI designation used across US, Gulf, Asia
- Ordered against ASTM A29 / A322 / A331
- Same UNS G41400 chemistry basis as EN19
- Confirm hardness band on the mill test certificate
4140 AISI Forged Bars Manufacturing & Heat Treatment
From Billet To Certified Bar
A quick look at how G41400 billet becomes a finished, traceable AISI 4140 Round Bar.
Hot Rolling / Forging
Billet reduced to round, square or hex bar section at 850-1200°C
Normalising
Heated to 840-880°C then air cooled for grain refinement
Quenching & Tempering
Oil quenched from 820-860°C, tempered 540-680°C on order
Cold Drawing / Peeling
Bright, hex and peeled bar sized to close tolerance
Inspection
Chemistry, hardness, straightness and UT cleared
Dispatch
Tagged and shipped with EN 10204 3.1 certificate
Alloy Steel AISI 4140 Round Bars Application Industries
Where Through-Hardening Strength Earns Its Place
To resist torsion, fatigue, and impact, AISI 4140 Round Bar goes on the BOM.
Oil & Gas Drill Collars, Tool Joints
Automotive Crankshafts & Axle Shafts
Gears & Pinions, General Engineering
Machine Tool Spindles & Collets
High-Tensile Bolts & Studs
Hydraulic Cylinder Rods & Pistons
Mining & Earthmoving Shafts
Valve Stems & Spindles
Surface Finish Options For 4140 AISI Bar
Finish is called out separately from the standard on every AISI 4140 Round Bar purchase order.
4140 AISI Black Bar, Hot Rolled
AISI UNS G41400 Bright Bar, Cold Drawn
4140 AISI Polished Bars, Ground
Peeled & Turned Round Bar
4140 Alloy Steel Threaded Bar, Rolled Or Cut
4140 AISI Polished Bar Documentation & Certification
Every AISI 4140 Round Bar consignment travels with a matching paper trail.
Mill Test Certificate
EN 10204 3.1 as standard, 3.2 on TPI-witnessed orders
Standard
NACE MR0175 Compliance Statement
Issued for normalised & tempered or SSC-tested lots
On Request
Heat Treatment Chart
Normalising, quenching and tempering cycle record
On Request
PMI & Chemical Test Report
Spectro reading confirming G41400 composition limits
Standard
Third Party Inspection Report
SGS, BV, TUV or Lloyd’s arranged before dispatch
On Request
Packing List & Certificate Of Origin
Bundle-wise packing list matched to invoice and MTC
Standard
SAE 4140 Round Bar Weight Chart
Weight per metre calculated at 7.85 g/cm³ density for common rack diameters.
| Dia (mm) | Kg / Metre | Dia (mm) | Kg / Metre |
|---|---|---|---|
| 10 | 0.62 | 75 | 34.71 |
| 20 | 2.47 | 100 | 61.70 |
| 25 | 3.86 | 150 | 138.83 |
| 32 | 6.32 | 200 | 246.80 |
| 40 | 9.87 | 300 | 555.30 |
| 50 | 15.43 | 400 | 987.20 |
| 63 | 24.49 | 500 | 1542.50 |
AISI 4140 Round Bar Price In India
Send a size-wise quantity list for per-kg pricing. Get it inside 24 hours, condition and finish already factored in, with HSN and GST worked out.
Stock, MOQ & Dispatch Timeline
From Enquiry To Gate Pass
The real clock on an AISI 4140 Round Bar order, not a marketing promise.
Day 0 – Enquiry
Mail diameter, length, condition and quantity to our Mumbai desk
Day 1 – Driven Quote
Per-kg rate against the day’s alloy reference, HSN and GST included
Day 3 – Inspection
Chemistry, hardness and PMI cleared, TPI called if needed
Day 5 – Dispatch
Rack sizes leave with LR copy and full document set
Rack Stock
10 – 150 mm Dia
Round, hex and square held in Mumbai
Minimum Order
500 Kg
Per size, trial lots considered
Large Dia Lead Time
20 – 30 Days
Above 200mm, forged against order
Export Transit
Nhava Sheva
Air or sea, FOB CFR CIF DDP quoted
1.7225 Alloy Steel Bar Testing Methods
A serious AISI 4140 Round Bar Supplier in India tests heats with full paperwork.
Chemical / PMI Analysis
Spectro reading against UNS G41400 composition limits
Hardness Test
Brinell or Rockwell C readings recorded heat wise
Tensile & Yield Test
Tensile, yield and elongation tested per ASTM A29/A29M
Impact / Charpy Test
Notch toughness confirmed on quenched & tempered lots
Ultrasonic Testing
UT for internal soundness on large diameter forged bar
Third Party Inspection
SGS, BV, TUV or Lloyd’s arranged before dispatch
AISI 4140 Round Bar Frequently Asked Questions
What is SAE 4140 Round Bar?
A chromium-molybdenum alloy steel bar used for shafts, gears and fasteners.
How is 42CrMo4 Steel Hex Bar different from stainless steel?
It’s a through-hardening alloy steel, not a stainless grade.
Where is WNR 1.7225 Hot Rolled Bar commonly used?
In shafts, axles, gears and high-strength industrial components.
What standard covers UNS G41400 Hexagonal Bars?
ASTM A29/A322 governs chemistry, mechanical properties and heat treatment.
What is the HSN code for DIN 1.7225 Rods?
HSN 7228, taxed at 18% GST in India.
See Where You Can Find Material Ex Stock
| Houston (USA) | Aberdeen (UK) |
| Jubail (Saudi Arabia) | Sharjah (UAE) |
| Rotterdam (Netherlands) | Singapore |
| Busan (South Korea) | Ludhiana (India) |
| Doha (Qatar) | Port Klang (Malaysia) |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA