UNS G41300 Tubing
UNS G41300 is the Unified Numbering System designation for 4130. It exists so that one alloy has one identifier regardless of which organisation's name is used for it.
What the UNS System Does
The Unified Numbering System is maintained jointly by ASTM International and SAE International. Unlike AISI/SAE designations — which are grade identification systems — the UNS provides a standardised alphanumeric code that uniquely identifies a specific alloy composition across different designation systems. 'G41300' means: G-series (wrought carbon and alloy steels), 41 (chromium-molybdenum family), 300 (the 4130 sub-grade within that family).
| Designation System | Identifier for This Grade | Authority |
|---|---|---|
| UNS | G41300 | ASTM/SAE (joint) |
| AISI/SAE | 4130 | AISI / SAE |
| EN (European) | 25CrMo4 | CEN |
| Werkstoff-Nr | 1.7218 | German DIN / EN |
| Supply form (verified) | Seamless tubing | Project source data |
| OD range (verified) | 0.25 in – 5.0 in | Project source data |
| Wall range (verified) | 0.035 in – 0.500 in | Project source data |
When UNS G41300 Appears in Procurement
Procurement documentation in aerospace, defence, and quality-managed manufacturing often requires a UNS designation rather than (or in addition to) an AISI/SAE designation. This is because the UNS number is unambiguous across national standards systems. An MTC that documents 'UNS G41300' alongside the ladle analysis provides the most system-neutral reference for quality auditors working across multiple standards jurisdictions.
Specifying UNS G41300 on a Purchase Order
Providing UNS G41300 on a purchase order identifies the alloy grade but does not specify the product form, standard, dimensions, or condition. These must be stated separately. A complete specification for UNS G41300 tubing: grade UNS G41300, product form seamless tubing, applicable standard ASTM A519 (or AMS-T-6736 for aerospace), dimensions (OD and wall), condition (e.g., Normalized), and MTC documentation requirement.
Reading a UNS Number
A UNS designation is a letter followed by five digits. The letter gives the family: G covers AISI and SAE carbon and alloy steels, S covers stainless steels, N covers nickel alloys and so on. For G-series steels the first four digits repeat the familiar grade number, so G41300 is simply 4130 with a trailing zero.
| UNS number | Grade |
|---|---|
| G41300 | 4130 |
| H41300 | 4130H, the same grade ordered to hardenability limits |
| G41400 | 4140 |
The UNS number identifies composition only. It is not a specification and carries no requirements for form, size, condition or testing, so it is always used alongside a product standard. You will meet it in material databases, in cross-reference tables and as a secondary entry on some certificates. Related naming systems are explained under AISI 4130 tubing and DIN 1.7218 tubing.
Frequently Asked Questions
Is UNS G41300 the same material as AISI 4130?
Yes. UNS G41300 is the Unified Numbering System cross-reference for AISI/SAE 4130. They identify the same chromium-molybdenum alloy composition.
Will my MTC show UNS G41300 or AISI 4130?
MTC documentation varies by mill. Some show both designations; others show only AISI/SAE 4130. For procurement audits requiring UNS designation, this should be explicitly requested when placing the order so the supplier can confirm the mill's MTC format.
What does the G in G41300 stand for?
It identifies the family of AISI and SAE carbon and alloy steels.
Can I order tubing to UNS G41300 alone?
No. Add a product standard, dimensions and condition, since the UNS number defines composition only.
Enquire for UNS G41300 Tubing
Specify your UNS G41300 requirement including product standard, dimensions, and MTC documentation needs.
- Grade: UNS G41300
- Product Standard
- OD and Wall
- Condition
- Footage / Tonnage
- MTC Requirement
- Delivery Location