ASTM A276 Type 904L Stainless Steel Bar

What is the ASTM A276 Specification?

ASTM A276 is a standard material specification covering hot-finished and cold-finished stainless steel bars and shapes. It establishes strict requirements for chemical composition, mechanical properties, dimensions, and surface conditions used in general corrosion-resistant and high-temperature service environments.

 

ASTM A276 904L Stainless Steel Bar Supplier

As a professional supplier with more than 18 years of experience in the stainless steel industry, GNEE provides a one-stop solution for the full range of ASTM A276 904L stainless steel bars. With over 2,000 tons of regular stock and a delivery time of 7–15 days, our products are exported to more than 50 countries worldwide, meeting the requirements of highly corrosive projects such as chemical desulfurization, seawater desalination, and pharmaceutical equipment.

 

Our ASTM A276 904L stainless steel bars include round bars, square bars, and hexagonal bars, with common diameter ranges from 6–500 mm and customizable lengths according to customer requirements. Tolerances can reach h8/h9 grade. Available surface finishes include black hot rolled, pickled, bright cold drawn (Ra ≤0.8μm), and polished finishes. The standard delivery condition is solution annealed, ensuring uniform chemical composition, eliminating processing stress, and maximizing corrosion resistance performance.

In boiling 40% CaCl₂ solution, the material remains crack-free after 1,000 hours of testing. Mechanical properties are stable after solution annealing, with tensile strength ≥490MPa, yield strength ≥220MPa, elongation ≥35%, and hardness ≤90HRB. It also offers excellent weldability and machinability. The ultra-low carbon design prevents intergranular corrosion after welding, eliminating the need for post-weld heat treatment. For cold working with a deformation rate of ≤30%, intermediate annealing is not required.

 

904L Stainless Steel Bars Specifications

Parameter	Requirement
Material Grade	904L – UNS N08904 (also known as UB6 / 1.4539 / X1NiCrMoCu25-20-5)
Chemical Composition	Per ASTM A276, EN 10088-3 or equivalent – MTC to confirm
Product Form	Round Bar (solid), hot-rolled or bright-drawn / peeled
Applicable Standards	ASTM A276 / ASTM A484 / EN 10060 / EN 10088-3 (or equivalent)
Surface Finish	Black (hot-rolled) or bright/turned – vendor to state condition
Tolerance on Diameter	As per ASTM A276 / EN 10060 standard tolerances
Heat Treatment	Solution annealed (1080–1120 °C), water quenched
Hardness	≤ 217 HB (per ASTM A276)
Test Reports	EN 10204 Type 3.1 Mill Test Certificate mandatory
Traceability	Full heat traceability; heat/lot number on each bar
Our 904L Steel Round bar conforms to NACE MR0175/ISO 15156

 

The following is our inventory of 904L stainless steel round bars.

Product Form	Diameter Range (mm)	Standard Length (m)	Tolerance (Precision)	Tolerance (Regular)
904L (UNS N08904 / UB6) Cold Drawn Bar	2.0 mm – 50.0 mm	3.0m / 6.0m	h8, h9, h10	± 0.05 mm
904L (UNS N08904 / UB6) Centerless Ground	5.0 mm – 100.0 mm	2.0m – 6.0m	h9, h11	± 0.03 mm
904L (UNS N08904 / UB6) Hot Rolled Bar	20.0 mm – 200.0 mm	3.0m – 9.0m	DIN 1013	± 0.2 ~ 1.0 mm
904L (UNS N08904 / UB6) Forged Bar	200.0 mm – 500.0 mm	1.0m – 6.0m	Rough Turned	-0 / +5.0 mm

 

Tolerance Chart of SS 904L Round Bar

Over	Inc	H7 J7 K7	H8 J8 K8	H9 J9 K9	H10 J10 K10	H11 J11 K11	H12 J12 K12	H13 J13 K13
1mm	3mm	0.009	0.014	0.025	0.040	0.06	0.09	0.14
3	6	0.012	0.018	0.030	0.048	0.07	0.12	0.18
6	10	0.015	0.022	0.036	0.058	0.09	0.15	0.22
10	18	0.018	0.027	0.043	0.070	0.11	0.18	0.27
18	30	0.021	0.033	0.052	0.084	0.13	0.21	0.33
30	50	0.025	0.039	0.062	0.100	0.16	0.25	0.39
50	80	0.030	0.046	0.074	0.120	0.19	0.30	0.46
80	120	0.035	0.054	0.087	0.140	0.22	0.35	0.54
120	180		0.063	0.100	0.160	0.25	0.40	0.63
180	250				0.185	0.29	0.46	0.72
250	315					0.32	0.52	0.81
315	400					0.36	0.57	0.89
400	500					0.40	0.63	0.97
500						0.44	0.70	1.10

 

SS 904L Rod Chemical Composition (Weight %)

Grade	Carbon (C)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Copper (Cu)
904L	≤ 0.020	≤ 2.00	≤ 1.00	≤ 0.045	≤ 0.035	19.0 – 23.0	23.0 – 28.0	4.0 – 5.0	1.0 – 2.0

 

Mechanical Behaviour of Hastelloy UNS N08904 Round Bar

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			Thermal Conductivity (W/m.K)		Specific Heat 0-1000C (J/kg.K)	Electrical Resistivity (n.m)
			0-1000C	0-3150C	0-5380C	at 1000C	at 5000C
904L	8000	200	15.0	–	–	13.0	–	500	850

 

 

IS SS 904L round bars magnetic?

They are completely non-magnetic. Due to its exceptionally high nickel content, 904L maintains a fully austenitic structure in any condition-even after cold working-making it entirely non-magnetic. This makes it suitable for use in precision instruments that require protection against electromagnetic interference.

 

ASTM A276 Type 904L Stainless Steel Bar Price

ASTM A276 Type 904L stainless steel bar generally costs between $1.30 and $4.50 per kilogram in bulk raw material, or roughly $1,500 to $3,000 per metric ton. Retail or custom-cut quantitiesfrom specialty suppliers can increase the price, ranging from $11 to $19 per kg depending on the origin.

 

Technical Inspection & Quality Assurance

Inspection Item	Testing Method / Requirement	Purpose
PMI Test	Handheld XRF Analyzer	Confirm Ni, Mo, Cu content.
UT Test	Ultrasonic Inspection (ASTM A388)	Ensure no internal cracks or shrinkage.
IGC Test	Intergranular Corrosion (ASTM A262 Practice E)	Ensure resistance to grain boundary decay.
Dimensional	Digital Caliper / Micrometer	Verify h9/h10/h11 tolerances.
Certification	EN 10204 3.1 / 3.2	Full traceability and material guarantee.

High-Quality Seafreight Packaging

All materials are strictly packaged in IPPC (ISPM 15) certified, seaworthy wooden crates, each with a maximum load-bearing capacity of 2,500 kg. Every bar (ranging in diameter from Ø2.0 mm to Ø500 mm) is encased in a 100μm-thick PE protective sleeve to completely eliminate mutual friction and surface abrasion between the bars.
The bar bundles are reinforced every 800 mm using high-tensile-strength galvanized steel strapping and are additionally supported by nylon lifting slings at their balance points to effectively prevent mechanical deformation.